diff --git a/Main.cs b/Main.cs
index 465767c..203903c 100644
--- a/Main.cs
+++ b/Main.cs
@@ -6,8 +6,15 @@ public class Main : Node
 {
 
     public int Seed;
-    private int _nParticles;
+    public float Zoom;
     
+    private int _nParticles;
+
+    public override void _Ready()
+    {
+        OS.MinWindowSize = new Vector2(1024, 600);
+    }
+
     public void StartSimulation(int nParticles)
     {
         _nParticles = nParticles;
@@ -15,7 +22,7 @@ public class Main : Node
         var particleSimulationScene = particleSimulationPackedScene.Instance<ParticleSimulationScene>();
         particleSimulationScene.Name = Seed.ToString();
         AddChild(particleSimulationScene);
-        particleSimulationScene.Initialize(nParticles);
+        particleSimulationScene.Initialize(Seed, nParticles, Zoom);
         GetNode<Control>("MainMenu").Hide();
     }
 
@@ -30,7 +37,7 @@ public class Main : Node
     {
         GetNode<ParticleSimulationScene>(Seed.ToString()).Hide();
         GetNode(Seed.ToString()).QueueFree();
-        Seed = (int) GD.Randi();
+        Seed = Mathf.Abs((int)GD.Randi());
         StartSimulation(_nParticles);
     }
     
diff --git a/MainMenu/MainMenu.cs b/MainMenu/MainMenu.cs
index fb72d83..aed85c2 100644
--- a/MainMenu/MainMenu.cs
+++ b/MainMenu/MainMenu.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using Godot;
 
 public class MainMenu : Control
@@ -10,6 +11,10 @@ public class MainMenu : Control
     private TextEdit _seedText;
     private TextEdit _particleCountText;
     private Button _randomizeButton;
+    private Label _zoomValue;
+    private HSlider _zoomSlider;
+
+    private Label _invalidLabel;
 
     public override void _Ready()
     {
@@ -20,17 +25,27 @@ public class MainMenu : Control
         _seedText = GetNode("MenuButtons").GetNode("Inputs").GetNode("Seed").GetNode<TextEdit>("SeedText");
         _particleCountText = GetNode("MenuButtons").GetNode("Inputs").GetNode("ParticleCount").GetNode<TextEdit>("ParticleCountText");
         _randomizeButton = GetNode("MenuButtons").GetNode("Inputs").GetNode("Seed").GetNode<Button>("RandomizeButton");
+        _zoomValue = GetNode("MenuButtons").GetNode("Inputs").GetNode("Zoom").GetNode<Label>("ZoomValue");
+        _zoomSlider = GetNode("MenuButtons").GetNode("Inputs").GetNode("Zoom").GetNode<HSlider>("ZoomSlider");
+        _invalidLabel = GetNode<Label>("InvalidLabel");
         
         // Connect signals
         _simulateButton.Connect("pressed", this, nameof(_OnSimulatePressed));
         _toggleFullScreenButton.Connect("pressed", this, nameof(_OnToggleFullscreenPressed));
         _randomizeButton.Connect("pressed", this, nameof(_OnRandomizePressed));
+        _zoomSlider.Connect("value_changed", this, nameof(_OnZoomSliderChange));
         
         // Random seed
         GD.Randomize();
-        var randomSeed = (int)GD.Randi();
+        var randomSeed = Mathf.Abs((int)GD.Randi()); 
         _main.Seed = randomSeed;
-       RefreshSeedText();
+        RefreshSeedText();
+    }
+
+    public void _OnZoomSliderChange(float value)
+    {
+        _zoomValue.Text = value.ToString(CultureInfo.InvariantCulture);
+        _main.Zoom = value;
     }
 
     public void RefreshSeedText()
@@ -41,8 +56,16 @@ public class MainMenu : Control
     public void _OnSimulatePressed()
     {
         // Start simulation with seed and number of particles
-        var nParticles = _particleCountText.Text.ToInt();
-        _main.Seed = _seedText.Text.ToInt();
+        var particleCountCheck = int.TryParse(_particleCountText.Text, out var nParticles);
+        var seedCheck = int.TryParse(_seedText.Text, out var seed);
+        if (!particleCountCheck || !seedCheck)
+        {
+            ShowInvalid();
+            return;
+        }
+
+        _main.Zoom = (float)_zoomSlider.Value;
+        _main.Seed = seed;
         _main.StartSimulation(nParticles);
     }
 
@@ -53,7 +76,7 @@ public class MainMenu : Control
 
     public void _OnRandomizePressed()
     {
-        var randomSeed = (int) GD.Randi();
+        var randomSeed = Mathf.Abs((int)GD.Randi());
         _main.Seed = randomSeed;
         RefreshSeedText();
     }
@@ -66,4 +89,19 @@ public class MainMenu : Control
             GetTree().Quit();
         }
     }
+
+    private async void ShowInvalid()
+    {
+        GetNode<Tween>("InvalidTween").ResetAll();
+        GetNode<Timer>("InvalidTimer").Stop();
+        GetNode<Timer>("InvalidTimer").WaitTime = 3.0f;
+        _invalidLabel.Modulate = new Color(1, 1, 1, 1);
+        var invalidTimer = GetNode<Timer>("InvalidTimer");
+        invalidTimer.Start();
+        await ToSignal(invalidTimer, "timeout");
+        var invalidTween = GetNode<Tween>("InvalidTween");
+        invalidTween.InterpolateProperty(_invalidLabel, "modulate:a", 1, 0, 1);
+        invalidTween.Start();
+        await ToSignal(invalidTween, "tween_all_completed");
+    }
 }
diff --git a/MainMenu/MainMenu.tscn b/MainMenu/MainMenu.tscn
index 49c3659..adcf8af 100644
--- a/MainMenu/MainMenu.tscn
+++ b/MainMenu/MainMenu.tscn
@@ -20,12 +20,12 @@ __meta__ = {
 
 [node name="MenuButtons" type="VBoxContainer" parent="."]
 anchor_left = 0.5
-anchor_top = 0.5
+anchor_top = 0.582
 anchor_right = 0.5
-anchor_bottom = 0.5
-margin_left = -259.5
-margin_top = -114.0
-margin_right = 259.5
+anchor_bottom = 0.582
+margin_left = -304.0
+margin_top = -172.5
+margin_right = 304.0
 margin_bottom = 172.5
 custom_constants/separation = 12
 __meta__ = {
@@ -33,17 +33,17 @@ __meta__ = {
 }
 
 [node name="Inputs" type="HBoxContainer" parent="MenuButtons"]
-margin_right = 519.0
+margin_right = 608.0
 margin_bottom = 150.0
 alignment = 1
 
 [node name="Seed" type="VBoxContainer" parent="MenuButtons/Inputs"]
-margin_right = 250.946
+margin_right = 200.0
 margin_bottom = 150.0
-rect_min_size = Vector2( 250.946, 0 )
+rect_min_size = Vector2( 200, 0 )
 
 [node name="SeedLabel" type="Label" parent="MenuButtons/Inputs/Seed"]
-margin_right = 250.0
+margin_right = 200.0
 margin_bottom = 27.0
 text = "Seed Number"
 align = 1
@@ -53,14 +53,14 @@ __meta__ = {
 
 [node name="SeedText" type="TextEdit" parent="MenuButtons/Inputs/Seed"]
 margin_top = 31.0
-margin_right = 250.0
+margin_right = 200.0
 margin_bottom = 95.769
 rect_min_size = Vector2( 0, 64.769 )
 text = "12345"
 
 [node name="RandomizeButton" type="Button" parent="MenuButtons/Inputs/Seed"]
 margin_top = 99.0
-margin_right = 250.0
+margin_right = 200.0
 margin_bottom = 150.251
 text = "Randomize!"
 __meta__ = {
@@ -68,26 +68,55 @@ __meta__ = {
 }
 
 [node name="ParticleCount" type="VBoxContainer" parent="MenuButtons/Inputs"]
-margin_left = 254.0
-margin_right = 519.0
+margin_left = 204.0
+margin_right = 404.0
 margin_bottom = 150.0
+rect_min_size = Vector2( 200, 0 )
 
 [node name="ParticleCountLabel" type="Label" parent="MenuButtons/Inputs/ParticleCount"]
-margin_right = 265.0
+margin_right = 200.0
 margin_bottom = 27.0
-text = "Number of Particles"
+text = "Particle Count"
 align = 1
 
 [node name="ParticleCountText" type="TextEdit" parent="MenuButtons/Inputs/ParticleCount"]
 margin_top = 31.0
-margin_right = 265.0
-margin_bottom = 95.769
-rect_min_size = Vector2( 0, 64.769 )
+margin_right = 200.0
+margin_bottom = 96.0
+rect_min_size = Vector2( 0, 65 )
 text = "1000"
 
+[node name="Zoom" type="VBoxContainer" parent="MenuButtons/Inputs"]
+margin_left = 408.0
+margin_right = 608.0
+margin_bottom = 150.0
+rect_min_size = Vector2( 200, 0 )
+
+[node name="ZoomLabel" type="Label" parent="MenuButtons/Inputs/Zoom"]
+margin_right = 200.0
+margin_bottom = 27.0
+text = "Zoom"
+align = 1
+
+[node name="ZoomValue" type="Label" parent="MenuButtons/Inputs/Zoom"]
+margin_top = 31.0
+margin_right = 200.0
+margin_bottom = 58.0
+text = "1.4"
+align = 1
+
+[node name="ZoomSlider" type="HSlider" parent="MenuButtons/Inputs/Zoom"]
+margin_top = 62.0
+margin_right = 200.0
+margin_bottom = 104.0
+min_value = 0.5
+max_value = 5.0
+step = 0.1
+value = 1.4
+
 [node name="SimulateButton" type="Button" parent="MenuButtons"]
 margin_top = 162.0
-margin_right = 519.0
+margin_right = 608.0
 margin_bottom = 213.251
 text = "Simulate!"
 __meta__ = {
@@ -96,7 +125,7 @@ __meta__ = {
 
 [node name="Warning" type="Label" parent="MenuButtons"]
 margin_top = 225.0
-margin_right = 519.0
+margin_right = 608.0
 margin_bottom = 270.0
 custom_fonts/font = SubResource( 1 )
 text = "Simulation cannot be resized 
@@ -105,7 +134,7 @@ align = 1
 
 [node name="HBoxContainer" type="HBoxContainer" parent="MenuButtons"]
 margin_top = 282.0
-margin_right = 519.0
+margin_right = 608.0
 margin_bottom = 282.0
 __meta__ = {
 "_edit_use_anchors_": false
@@ -113,7 +142,7 @@ __meta__ = {
 
 [node name="ToggleFullscreenButton" type="Button" parent="MenuButtons"]
 margin_top = 294.0
-margin_right = 519.0
+margin_right = 608.0
 margin_bottom = 345.251
 text = "Toggle Fullscreen!"
 
@@ -131,5 +160,41 @@ rect_scale = Vector2( 0.35, 0.35 )
 mouse_filter = 2
 texture = ExtResource( 2 )
 __meta__ = {
+"_edit_lock_": true,
 "_edit_use_anchors_": false
 }
+
+[node name="Controls" type="Label" parent="."]
+anchor_left = 1.0
+anchor_top = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = -183.0
+margin_top = -81.0
+margin_right = -10.0
+margin_bottom = -12.0
+custom_fonts/font = SubResource( 1 )
+text = "Controls
+R to Restart
+Esc to Exit"
+align = 1
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="InvalidLabel" type="Label" parent="."]
+modulate = Color( 1, 1, 1, 0 )
+margin_left = 15.0
+margin_top = 16.0
+margin_right = 226.0
+margin_bottom = 43.0
+text = "Invalid Inputs!"
+uppercase = true
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="InvalidTween" type="Tween" parent="."]
+
+[node name="InvalidTimer" type="Timer" parent="."]
+one_shot = true
diff --git a/ParticleSimulation/ParticleSimulationScene.cs b/ParticleSimulation/ParticleSimulationScene.cs
index 5d74bdf..ad24d33 100644
--- a/ParticleSimulation/ParticleSimulationScene.cs
+++ b/ParticleSimulation/ParticleSimulationScene.cs
@@ -10,15 +10,14 @@ public class ParticleSimulationScene : Node2D
     private ParticleSimulation _particleSimulation;
     public float PhysicsInterpolationFraction;
 
-    public void Initialize(int nParticles)
+    public void Initialize(int seed, int nParticles, float zoom)
     {
         _particleNodes = GetNode<Node2D>("ParticleNodes");
-        var seed = GetParent<Main>().Seed;
         GD.Seed((ulong)seed);
         GD.Print("Last Seed: " + seed);
         var viewSize = GetViewportRect().Size;
-        var zoom = GetNode<Camera2D>("Camera2D").Zoom;
-        var spaceSize = new Vector2(viewSize.x * zoom.x, viewSize.y * zoom.y);
+        GetNode<Camera2D>("Camera2D").Zoom = new Vector2(zoom, zoom);
+        var spaceSize = viewSize * zoom;
         _particleSimulation = new ParticleSimulation
         {
             SpaceSize = spaceSize
diff --git a/ParticleSimulation/ParticleSimulationScene.tscn b/ParticleSimulation/ParticleSimulationScene.tscn
index 348b4b0..abb3829 100644
--- a/ParticleSimulation/ParticleSimulationScene.tscn
+++ b/ParticleSimulation/ParticleSimulationScene.tscn
@@ -2,7 +2,6 @@
 
 [ext_resource path="res://ParticleSimulation/ParticleSimulationScene.cs" type="Script" id=1]
 
-
 [node name="ParticleSimulationScene" type="Node2D"]
 script = ExtResource( 1 )
 
diff --git a/ui/ui_theme.tres b/ui/ui_theme.tres
index f9f9106..5b4bb64 100644
--- a/ui/ui_theme.tres
+++ b/ui/ui_theme.tres
@@ -283,7 +283,7 @@ TextEdit/colors/bookmark_color = Color( 0.08, 0.49, 0.98, 1 )
 TextEdit/colors/brace_mismatch_color = Color( 1, 0.2, 0.2, 1 )
 TextEdit/colors/breakpoint_color = Color( 0.8, 0.8, 0.4, 0.2 )
 TextEdit/colors/caret_background_color = Color( 0, 0, 0, 1 )
-TextEdit/colors/caret_color = Color( 0.88, 0.88, 0.88, 1 )
+TextEdit/colors/caret_color = Color( 0, 0, 0, 1 )
 TextEdit/colors/code_folding_color = Color( 0.8, 0.8, 0.8, 0.8 )
 TextEdit/colors/completion_background_color = Color( 0.17, 0.16, 0.2, 1 )
 TextEdit/colors/completion_existing_color = Color( 0.87, 0.87, 0.87, 0.13 )