This is quite a nice little 3d platformer. I do like how you put in 2d assets into a 3d game, it gives that nice 2.5d charm to the game. The mouse is also nicely drawn. The VA is also quite a nice addition to the game, though it's a bit hard to hear and understand at times. The level design is decent, with nice little checkpoints dotted around the level, which helps ease the frustration a bit.
As for some criticisms, I think the main issue is that the mouse has no shadow, making judging distance and jump height almost impossible at times. Pairing with the fact that the lighting, although very cool with the black and red, is very dark, and even completely hides the mouse in certain areas. I resorted to blindly guessing where the mouse is, and that doesn't feel good to play.
Anyway, still good job making this platformer. I quite enjoy it for the most part. Good job!