what stops someone from botting this game?
It isn't easy to make bot for this game. Sometime in the future maybe someone will make such a bot. Then this currency will be mined with these bots, it will be like switch from CPU -> GPU -> ASIC for other cryptocurrencies. But I don't expect this to happen soon.
ok.
How do you prove that someone really played the level he got created? What if he modifies his client? How can you stop this behaviour?