This is probably one of the most challenging games you will ever play, and its loads of fun.
The gameplay was very good it presented a real challenge and it is very fun to see the aliens green guts splatter everywhere when you toss a grenade at em. One thing I really enjoyed about this game was that when you die you get a continue (about 3 of them) and you restart the level but the aliens that you killed will stay killed Unless you use all your continues up. Theres a huge variety of weapons I would have to say that the machine gun is my favorite due to the ammount of damage it can do to a hoard of alien bugs, but the sniper rifel too is very powerful as well its a one shot kill usually.
So in conclusion i give this game a 9/10 its really worth owning and i strongly recomend it to anyone who likes shooters. I myself emulated this game (since its free) and enjoy it very much. Well thanks for reading and goodbye.