This game looks cool. Interesting idea, and very nice graphic. I just want to advise you to pay more attention to the main character, not just the scene objects like balls, it should make game more dinamic/active. Thats not all. Another advise is for average and high dificulty levels. Make the boxes(and other things) what located in blue dimension fully invisible for player while you in red one, i think it will be more interesting 
I hope my advises was helpful, anyway good luck in game dev)
PS. Sorry for my Eng, actually its not my native, but i tried