Good memories here. This game was really amazing back then, it's a pain I can't play Dark Forces any more because about 30 minutes of playing it makes me feel very dizzy. A classic old school Star Wars FPS without lightsabers and Force powers. This was well... better than Doom in my opinion. Same controls, but you could jump and crouch, look up and down, which was rare back in the day.
I think the game's strongest part is the well designed levels- great atmosphere, especially from 4th level where you need to get Crix Madine out of an imperial prison facility. Then, you need to infiltrate an Imperial Research Facility, visit Nar Shaddaa, which is another hive of scum and villainy, escape Jabba's ship, board the Executor imperial ship- loved to see Tie Fighters leaving the ship's hangar there.
The story is no big deal, definetely not the strongest point of this game in my opinion. It' about the Empire comes up with a new very dangerous weapon, the Dark Trooper, and tries to conquer the entire galaxy. Your mission to find and destroy the Arc Hammer, where the Dark Troopers are being manufactured.
Enemies are usually dumb, you mostly do target practice, except the spots where you got a lot of them, sometimes they even surprise you. Sounds and music work also pretty well, the game uses the classic iMuse music system, which debuted in Monkey Island 2.
If you don't get dizzy and you are ok with the dated graphics, buy this classic - there are some downloadable graphics mod online which improves the graphics a lot, with those installed, the game can be upgraded to a higher resolution, and modern controls instead of the old Doom controls.