Cool concept, for sure. Fit with the theme and with good sound effects too. The game is VERY unforgiving though. The life limit barely got me to lvl4. And then it's back to the beggining. Not satisfying, I must say. Maybe a death counter would work better to discourage dying? Also, something very small, but very annoying - the piano resets on every death, so every 5-10 seconds. There is probably some decent music in your game, but we'll never get to hear it, because it's constantly resetting. Still, the game is finished, playable and without a doubt challenging.