I understand that you tried to make this as an old school 3D Platformer but we see those games through tinted glasses and we remember them to be better than they actually are. So I would recommend that you reduce a pixelation a bit because its really disturbing and there are a lot of bugs. You stick to walls and you smash jump you can climb up on the wall. Also the floor is way too slippery so you might want to reduce the speed of the player. Other than that, good effort bro.
Also, this might sound weird because I criticized your game but could you please rate my game? I would be very grateful if you rate it.