I like your concept and the first level really nicely introduced the mechanics with an obvious rock fall.
I wasn't able to get past the 2nd level though. I feel like you did a good job teaching us in the 1st level but then left the player completely on their own in the 2nd level. That would probably be more suited to a later level once you have taken the player through the core mechanics a few times.
Would be interested to know what your expected solution was for the 2nd level? was I supposed to jump over the black chook?