Well done, I really like the concept especially changing dimensions looks really good :)
Some feedback, for the art it kind seemed like the character is always staring at the player while going right actually if you add more to it it might make sense to make the character look into the direction he is running :) After some hooks there is a big empty space below I am not sure if this was the end of the game or if I just missed something there? :D
Really well done given the timeframe and quite the interesting idea :)