The intros, art, and tutorial/controls were all incredible and made the game so approachable and enjoyable. There's a real personal touch to it.
The gameplay loop was simple yet very compelling (my high score is 7000!), and the challenge scaled well.
I saw no reason to stop breathing fire, so I'd rather the fire be default, my thumb got tired. Or it would be more comfortable to breath fire when I use the arrow keys.