First of all I must tell you I've played this game years back and I could not remember more so I bought it form GOG and I decided to give it a shot. It's FPS, an old school FPS with a twisted story. I didn't enjoy much the cut scenes are a little shallow and the dialogue boring and biased by poor acting. But the main quality of this game is the shooting itself. You've got different weapons you can use, the weapons sound real and the enemies are hard to be shot down. Prepare to save as often as possible because you'll die many times.
I didn't like the end because I think it's a little off the edge, but overall "Chaser" can be considered a solid old-fashioned shooter.