a few things..
1st, it lagged really bad after like level 6. my pc isnt strong but well.. at least a quality option.
2nd, u get money too slowly, and the game surely gets reppetitive after a while.
3rd - seemed like machinegun was better than rockets, the rockets werent really cool as rockets should be, rockets r cool everybody knows that.
4th - the whole game is really slow paced. at some level u just wish the game would end.
after all u really need to improve some things, the game isnt so bad as some people here have said. this game isnt in the right league for downloading or selling it.
keep flash games free, thats my last words.