This is such a cool idea for a puzzle game! Easy to pick up and play, and I like that you added a playable tutorial to learn the mechanics. I loved it, and I think this could make a really neat and addictive mobile game!
I ran into a bug where I killed the last enemy on screen but also died at the same because I didn't have enough health, but then when I reset the game the exit was right next to me. Was that supposed to happen?
Also:
Is the game randomly generated and did I just get very unlucky with the amount of enemies on the screen? :D