Please jus try to do some art, I mean this game is quite soulless, try to use a color pallet, add some post-processing(especially bloom), also the hitboxes are way to unfair and when you died it just pops out a "You died" screen with no cooldown like try to add a time for the player to actually see where he/she messed up and make that cube explode or something.
Not a very solid game but it's a start, so do not get discouraged and keep improving.