Nice entry! At first I was a bit frustrated with the game (almost quit at the third level, lol) but enjoyed it at the end. I think I would have enjoyed the game a lot more if the velocity of the blocks was slower. If the intention is to make a puzzle game then maybe the game shouldn't be testing the reaction times of the player so much (personally) and the relaxing ambiance of the music would fit the gameplay more. I think only one arrow on the blocks indicating where the point of gravity is would be more intuitive or maybe it would've made me understood the mechanics a bit faster. That's all I have to say :)