Very fun and cute platformer game. The level design is fairly straight forward but the mechanic is very interesting. There are some small problems like how wall-jumping isn't explained in the game nor the description. The hawks make for an interesting obstacle but may need to be improved for an easier way to telegraph their behavior. Sometimes touching the red blocks will kill you twice, and the screaming sound effect is stacked if you complete a level and get pushed down a hawk (although it is very funny). 

It would also be a good idea to give specific colors for specific blocks, as I got confused when I found out about the horizontal block and didn't see a lot of differences for the other blocks.