diff --git a/half-earth/materials/cursor.tres b/half-earth/materials/cursor.tres
index a3218a5..91a714d 100644
--- a/half-earth/materials/cursor.tres
+++ b/half-earth/materials/cursor.tres
@@ -4,6 +4,6 @@
 
 [resource]
 shader = ExtResource( 1 )
-shader_param/baseColor = Color( 0.992157, 1, 0, 1 )
-shader_param/highlightColor = Color( 1, 0, 0.984314, 1 )
-shader_param/isHighlighted = 0
+shader_param/lowColor = Color( 1, 0.960784, 0, 1 )
+shader_param/highColor = Color( 0.921569, 0, 1, 1 )
+shader_param/t = null
diff --git a/half-earth/materials/tile.tres b/half-earth/materials/tile.tres
index 327c5eb..9f921a3 100644
--- a/half-earth/materials/tile.tres
+++ b/half-earth/materials/tile.tres
@@ -5,6 +5,6 @@
 [resource]
 resource_local_to_scene = true
 shader = ExtResource( 1 )
-shader_param/baseColor = Color( 0.0823529, 0, 1, 1 )
-shader_param/highlightColor = Color( 1, 0, 0, 1 )
-shader_param/isHighlighted = null
+shader_param/lowColor = Color( 0.0313726, 0, 1, 1 )
+shader_param/highColor = Color( 1, 0, 0, 1 )
+shader_param/t = null
diff --git a/half-earth/scripts/GridCursor.cs b/half-earth/scripts/GridCursor.cs
index fd97c42..6ff61a0 100644
--- a/half-earth/scripts/GridCursor.cs
+++ b/half-earth/scripts/GridCursor.cs
@@ -8,7 +8,7 @@ public class GridCursor : Sprite
     private WorldGrid _grid;
     private ShaderMaterial _material;
 
-    private const string IS_HIGHLIGHTED = "isHighlighted";
+    private const string T = "t";
 
     public override void _Ready()
     {
@@ -38,11 +38,11 @@ public class GridCursor : Sprite
                         var pos = mouseButtonEvent.Position;
                         _grid.GetGridPos(pos, out var x, out var y);
                         _grid.ToggleTileHighlight(x, y);
-                        _material.SetShaderParam(IS_HIGHLIGHTED, 1);
+                        _material.SetShaderParam(T, 1f);
                     }
                     else
                     {
-                        _material.SetShaderParam(IS_HIGHLIGHTED, 0);
+                        _material.SetShaderParam(T, 0f);
                     }
                     break;
             }
diff --git a/half-earth/scripts/WorldGrid.cs b/half-earth/scripts/WorldGrid.cs
index 7f55d6c..8a69681 100644
--- a/half-earth/scripts/WorldGrid.cs
+++ b/half-earth/scripts/WorldGrid.cs
@@ -30,7 +30,7 @@ public class WorldGrid : Node2D
             {
                 var tile = _tiles[x, y];
                 var material = tile.material;
-                material.SetShaderParam("isHighlighted", tile.isHighlighted ? 1 : 0);
+                material.SetShaderParam("t", tile.isHighlighted ? 1f : 0f);
             }
         }
     }
diff --git a/half-earth/shaders/tile_shader.gdshader b/half-earth/shaders/tile_shader.gdshader
index 98f8fe0..537a2b6 100644
--- a/half-earth/shaders/tile_shader.gdshader
+++ b/half-earth/shaders/tile_shader.gdshader
@@ -1,9 +1,9 @@
 shader_type canvas_item;
 
-uniform vec4 baseColor : hint_color;
-uniform vec4 highlightColor : hint_color;
-uniform int isHighlighted;
+uniform vec4 lowColor : hint_color;
+uniform vec4 highColor : hint_color;
+uniform float t;
 
 void fragment() {
-	COLOR = mix(baseColor, highlightColor, float(isHighlighted));
+	COLOR = mix(lowColor, highColor, t);
 }