It's normal. my bad, i don't explain any mechanics in the game. Here is two functions of "cube" 1 - open (access to) doors , 2 - use as projectile. And about mechanics . You can speed up and wall jump (you jump higher when you faster).
I really don't know what to improve. Gameplay is addictive but... Only what i feel about your game is to add something (like new mechanics or some kind of progression)... Oh! I know what you can improve - make "flow" not linear or random obstacles and maybe its fun when multiplayer... That's a dead end of game concept itself... In case of my vision about that game of course.
"Wall jump"