This is an all in all nice game, it reminds me of a game called jet pack joyride on the app store (it's free ;)). The fart thrusting needs to be stronger it just seems weak.
A good game, fun sound effects random character, but that I'm fine with. Nice BGM and an all around good game, good job.

Not a bad game.
The game starts out far too slow, you should up gem gain at the start as once you reach the value 5 gems there are no problems at all. Music is ok. Design is good.

You've got something fun going here, but a little refinement could make a big difference.

Like everyone is saying, that zombie ass needs more thrust. The rate at which the zombie falls outweighs the rate at which he rises from the ground. I would suggest cranking up the thrust of the fart so that it lifts the zombie at about 75% of the falling speed (right now it feels like it's around 40%-50%). You're algorithms might not allow such a direct manipulation of the physics, but I'm sure you can tweak it and just feel it out.
(If anything, you could at least increase the thrust from running position. While on foot, the zombie would technically be able to gain more thrust by jumping and farting at the same time. This is more practical than just depending on the fart alone to initially lift off of the ground.)

And just to be picky, turning off the music also turns off the sound effects. The music gets kind of annoying, but I still want to hear the fart sounds because they make me giggle. If you don't want to separate the sounds and music, changing "[M]usic" to "[S]ound" would make more sense.

All in all, I liked it. You can't go wrong with farts. :)

Not bad. But you need to randomize the spikes and things. If you can memorize the pattern you can always win. Not bad though :)

Nearly unplayable for me, I don't have enough time to react or enough jet power to avoid barriers. Missiles are also hard to avoid...
Good music, I can't remember from where it comes, physics and game art is alright.