Wow! I really didn't expect you to play my game! I made a point of trying to make my game look and sound good. During the development period of the jam I couldn't really think of a way to make ghost mode more fun, but I've gotten some ideas I will implement after the rating period. I have noticed the issue with spikes' hitboxes, but as you said, it'd not much of an issue for a gamejam entry. I will fix it afterwards, though.
Really, thank you for the feedback!