Smart use of the theme, I'm also glad you gave the player an opportunity to try the doors they skipped at the very end. The jump for me went way too high and I was constantly bumping my head on the ceiling making it hard to beat certain areas, I imagine its a runtime issue or physics update problem.. idk. Also, the spikes going up and down sort of imply that they have moments of 'safety' but that was not the case.. just something to think about. Great entry!