I wouldn't really call this a platformer without a character, even though the box isn't human it is still the player's form of agency within the game. A platformer without direct control would be more fitting, I think.
As others have said, the controls are very sensitive, which results in the box flying all over the place. I think it might contribute to some of the glitches too as it must be hell for the collision detection. Graphics are really nice. One suggestion, a button to refocus the camera on the box might be good.