Not too bad
Not a bad game, basic upgrade, get cash, upgrade more, get more cash etc.
1 thing that annoyed me, is the annoying transitions between screens. In a game like this, you want it to be quit and not have to wait for a damn fade in/out to complete. And then the timer in the battle... zzzzz.
Otherwise though it's very fun, and gets more fun towards the end, as you can try different combinations. More interaction would have been nice though... as well as more choice ^^;