Alien Breed 3D and Alien Breed 3D II -were fantastic in their day.
Can't believe nobody has mentioned 'Genetic Species' -it was a great game.
What about 'Gloom'- great fun and ran nicely on a standard A1200.
T-Zero, Disposable Hero, Shadow of the third Moon, Fire and Ice, Uridium II and Foundation. -all great games that I spent a lot of time playing. -All worth picking up and playing if you don't have them already.