I like the art and the music.
Some criticism:
- the jump feels floaty. You can increase the gravity and make the jump hight depending on how long you press the button to fix this
- the idea with the dying and collecting green circles is odd to me. I dont really get what you where trying to do here. Maybe define the idea a bit more.
- The music starts playing over itself when you play the game a second time
_(this is a small thing but it annoyed me: there a two exits in the last scene of the game and I played through it twice to go into both of them but nothing happens if you go into the other one.)