Cute and clean! The bright Kenney-style art and the one-click control make it instantly understandable, and watching the blocks topple so the little ball reaches the gem is very satisfying. The difficulty ramps up gently, which I appreciated. One suggestion: adding some sound or small visual feedback when blocks fall or the gem is reached, and maybe a way to undo a wrong removal instead of waiting for the restart, would make it feel even better. Nice entry!