Well, I'm put off by a couple of design decisions.
Whereas most games of this ilk are designed to make you want one more go when you inevitably fail, the mocking laughter every time you crash doesn't engender a lot of good will toward the game.
On top of that, in the demo version, you get a full screen ad every time you retry. You've got to hit retry, then dismiss the ad, then hit next to get back to the game. This'd be intolerable in an F2P game, let alone an 8 level demo.
The controls are the final nail in the coffin for me at the moment, though. The buttons are tiny, offset diagonally and you have to press them exactly. If you slide your fingers left or right between buttons to make the tiny adjustments this sort of game requires, it's too easy to end up above or below the other button, leading to an instant crash and another ad.