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half-earth/nodes/interaction_modes/heat_overlay.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://scripts/overlays/HeatOverlay.cs" type="Script" id=1]
+
+[node name="Heat Overlay" type="Node"]
+script = ExtResource( 1 )

half-earth/scripts/overlays/HeatOverlay.cs

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+using Godot;
+using System;
+
+public class HeatOverlay : Node
+{
+    public override void _Ready()
+    {
+
+    }
+}

half-earth/scripts/overlays/NoOverlay.cs

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+using Godot;
+
+public class NoOverlay : Node
+{
+
+}

half-earth/scripts/overlays/Overlays.cs

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+using Godot;
+using System;
+
+public class Overlays : Node
+{
+    [Export]
+    private KeyList _cycleOverlayKey;
+
+    public override void _Ready()
+    {
+
+    }
+
+    public override void _Input(InputEvent @event)
+    {
+        base._Input(@event);
+
+        if (!(@event is InputEventKey keyEvent))
+            return;
+
+        if (!(keyEvent.Pressed))
+            return;
+
+        if ((KeyList)keyEvent.Scancode != _cycleOverlayKey)
+            return;
+
+
+    }
+
+    private void CycleOverlay()
+    {
+
+    }
+}