This is one of the games where you don't have enough money for zombie games, or you have a high end PC. This is one of the games to at least spare half an hour on.
Off of that though, if you do have a good PC that can run survival games, this is one of the games that really isn't worth more then maybe 20 minutes on. It aims at trying to give you the "horde" feeling in which it does but in very small amounts.
But then again, this is a flash game that is non-profit so I can't talk shit about this game much.