My only problem is that there's a lot of lag after a level (where it brings up your score/goes to the menu) - but other than that, fantastic and really addictive game!
Way way way way too much grinding for that last level, ruined the whole game for me, would involve spending about the same time grinding to max everything out as I spent on every single level prior. Turned a 5 star game into a 3 star, easily.
I got 10 elite horsedudes at like 10/32 cities and now i'm just OP, and that was completely without grinding. I literally just stand there and they destroy anything and never die and I'm just about to get my 32/32. Way too unbalanced. Needs incentive to actually fight yourself, and a SELL ALL BUTTON IN THE BLUMMIN' SHOP.