Cubey is very cubic LOL. By the way, the game looks not that bad, very surreal with those blocks flying in space. Platforming is okay, but it's hard to jump in 3D with fixed camera, I would suggest removing W/D movement or adding camera control. Maybe, you can make some mechanics connected with size or shape. I remember the game "140", where the character changes shape in different states, however I guess there it was for estetics.