Fun game but big problems: 1.) No hotkey for boost 2.) Some upgrades have no effect: ie. More bonus items 3.) Less people on later levels gets boooooring 4.) Some Mutations don't work (Swag) or are pointless (Bomber) 5.) Screen moves so fast you can't anticipate the good stuff
I'm about half-way through, but won't finish without speed controls! Its just way too slooooooooooooow later. 3 Stars until this gets fixed
Plus, it needs some reward for playing earlier levels again. The upgrade system just isn't rewarding enough