Very nice! It fits the theme well! I have two suggestions though:
1. Tell the player that they can use right click to change powers, I didn't find out about that until later.
2. Find a way to fix the blurry pixel art, it kinda takes away from the experience. In Godot (the engine I use), there is simply a checkbox in the project settings that you have to uncheck to fix that. I would assume it is similar in Unity.