This was a very cute game, I loved the animations!
The mechanics were very polished, but I felt like the level design was frustrating... you have to wait for each level to end with no way of speeding it up, and avoiding the blocks is incredibly tricky when you have to go through a one tile high gap to get a gem or to leave from getting a gem. If blocks kill me just from slightly entering my tile, then there really can't be blocks one tile apart from each other that you're intended to go through.
The effects & stylization were really cool, though I kinda thought the title said "AUDIO TETRIS" which would have been a very different sort of game...!