I think this is a very unique take on 3D platformers and I like that, however I don't know why but I get acrophobia (fear of hights) in this game and I am afraid of hights but this is a first for me that this fear also exists in a game, so this was also a horror game for me. I don't know if that was intended or if this is a coincidence, but do whatever you want with this information.
Besides that I also got a bit scared of jumping in this game, because it is a jump into the unknown and I don't get the feeling that that is what you had in mind for the game, especially with how you designed some of the jumps and how little usage of the checkpoints there is and with a timer to remind me that I am slow and a more action filled classical musical piece.