Hi!
Very cool idea with a lot of potential! The graphics is very cool!
The critic I have is mostly the speed against the size of the blocks. It was very hard to hit the blocks when they where placed alone and it became more of learning exactly how high you jump to figure out the best place to put a block so you did not need to align it on the way down.
As I said, the graphics and all is amazing so just adjusting some of the variables for the player and adding some of the features I saw other people commented I think this will be a blast to play!
Great work and keep it up man!