The idea is really cool, it took me a second to understand what was going on but once you get it its fairly simple.
The only issue i could see, but its only for me as i like games where i can control the odds, is that in the end its purely a game of luck. Even if i try to put the odds on my side, at the end luck decide everything. But this is not really a flaw in itself, the theme was gambling and a game of luck totaly fits in my opinion.
Im sure you can expend the concept into something really sweet.
Couple things : add a mute button or volume control would be cool :)