Nice runner, the graphics and music go well together =)
I was about to suggest a double-jump powerup when I got one!!! But I couldn't see the choice more than a fraction of a second. It tried another game and I've been more careful but I didn't understand how to make a choice.
I think the choice should be announced by a visible powerup, or a warning 2 seconds before choosing. And a simple button press should not choose straight away. You could have a switch between choices with a simple button press, and a validation with a long press (3 seconds, with a progress bar).
Just some suggestions to make it more satisfying, but it's already pretty cool, congrats!