Nice tune.
Alright, the game looks nice with all the Post Processing, everything seems to be the same resolution - well done.
You should have made so when you take damage that the dragon flashes red or white so I know I've been damage, I got confused at the start why I was dying then I noticed my hearts are disappearing after touching the flames - damage should be better communicated.
Gameplay is engaging for a few minutes, enough for a game jam - you should always give everything the game has to offer to the player in first couple of minutes since people won't linger for too long in a game jam game.