Sluggish controls. The entire game becomes laggy as more enemies come on screen. As others have said keyboard control would be great at least the sluggish controls wouldn't be so visible/annoying. It's a pitty I've enjoyed other IriySoft games.
Boring, slow graphis. Do we really need to see the store turn on every day? Slow taking orders, upgrades should improve gameplay. It's repetative, can't believe it's running #1 for the month right now.