Super fun mechanic with the controls, tight level design and clever goals, overall great execution!
The game feels great, is challenging enough to have players enjoy collecting all the keys. Controls aren't perfect, but they're pretty much what the player would need for this type of level design.
I did get tired of the ost after a while, and I also would have preferred more sfx. But what's there is fully functional and works perfectly.
A bit more content would have been nice, but that's about it, very few negatives in general, good job!