If my son ever tells me one day that he want's to become a cube when he grows up because cubes lead a simple life, I will tell him that the world can be so unpredictable from time to time and even a cubes life can be a hard one.
I think the gameplay is quite original and could be interesting if further developed, maybe including a tool tip text somewhere in the UI like .. press esc for options or to tell the player what they are actually doing when that control board pops up in the beginning actually does :D.
anyway, It looks great and it's got potential so as a prototype it functions rather well!. GJ