very good
i really liked this, it had a good charm to it.
the music fitted the game perfectly, it was very intense and i always felt unsafe, which is very cool.
I personally liked the controls, you get used to them easily and it made it more chalenging. I eventually did complete it (46599 points ^^) and it was satisfying to complete, mainly from the paranoia that the one block island i was ocupying would be crushed!
there can be improvements to it though, like make all the blocks transparent and not have a button for it, i found that i never had time to check were i am. also different sprites would be nice.
overall though a very fun and addictive game! well done!