This game was fun and well executed ! The only thing that I didn't like so much was that we don't have any visual feedback to know which tiles will fall. I imagine that it was a design decision and I respect that, but I admit that I would prefer a more predictable puzzle playstyle than this die and retry-ish system.
Anyway, everyone have his own preferences, and you did a great job : the visuals are good, the sound design is great, and the gameplay is pretty clear and well balanced in terms of difficulty.
Great job !