Nice little game played it for a while.
I think there are really 2 Game Killer. First you have to jump half a second after the start... If not you die. And sceond when you die, you have to restart the game. Maybe just add a gamover screen with a button to restart the scene.
I assume this is one of your first projects. It is nice ;-) just a little short. Make some more games and you will improve!
Congratulation for finishing your game within the jam! Thats more than many people can say.