Everything is wrong with this game. Extremely high CPU usage, fancy controls, repetitive gameplay and annoying "GIMME KREDS!!!" everywhere. If you want our money, make a better game before. 1/5 for sure.
TOMp45: do not forget, that the price of every next AI is higher. You can get the same DPS after spending X AIs if you have X/(X-1), but your AI per second will drop significantly.
Games like this one badly need auto-pause if the focus is lost. It is too easy to click outside the game screen if you're not playing on full screen. Anyway, a nice game.
This is one of the best flash games ever made, but I would add some weird features that make sense to nobody but me. Also I would remove some random things, add some random things and make the game at least two times better somehow.
Thank you for listening to players' feedback and useful updates.
Yet I think that at low quality settings coins should be disabled. The game lags quite a lot with many boards on screen.