Good game, I had fun playing it :) I have a few little ideas:
- You can move the start button from enter to space. It would be much more comfortable I you didnt have to change your fingers position
- You can make the game an auto runner, because it didnt seem you have to go in another direction, so you can concentrate more on jumping and shooting
- At the first moment, i tought the boxes were bad, so you can change the sprite, so it looks more like it will help you