oK, suckish.
I believe this game is old because I can remember playing it a long time ago, but still the few upgrades and the lousy way you get overrun no matter what you do when you get past round 10 is annoying and makes the game sucky, the fact that you have to headshot the small ones to one shot then makes the experience not as good because aiming isn't as easy as it might seem in this game. well.. yeah..