Fix hit decal color by using SelfModulate

src/Objects/Block.cs

@@ -1,9 +1,12 @@
 using Godot;
 
-public class Block : StaticBody2D
+public class Block : StaticBody2D, IInitializable
 {
     public new BlockPos Position { get => BlockPos.FromVector(base.Position);
                                    set => base.Position = value.ToVector(); }
-    public Color Color { get => Modulate; set => Modulate = value; }
+    public Color Color { get => Sprite.SelfModulate; set => Sprite.SelfModulate = value; }
     public bool Unbreakable { get; set; } = false;
+
+    public Sprite Sprite { get; private set; }
+    public void Initialize() => Sprite = GetNode<Sprite>("Sprite");
 }

src/Objects/Player.cs

@@ -17,7 +17,7 @@ public class Player : KinematicBody2D, IInitializable
 
     public int NetworkID { get => int.Parse(Name); set => Name = value.ToString(); }
     public string DisplayName { get => DisplayNameLabel.Text; set => DisplayNameLabel.Text = value; }
-    public Color Color { get => Sprite.Modulate; set => Sprite.Modulate = value; }
+    public Color Color { get => Sprite.SelfModulate; set => Sprite.SelfModulate = value; }
 
     public float Health { get; set; } = 1.0F;
     public bool IsAlive => Health > 0.0F;