- Astonishing graphics , start and ending
- A strange camera (over player’s shoulder)
- Very hard control , although i am an expert fps player.
- Good timing of creepy appearances of aliens over corners or walls.
- Superb soundÂ with my Sony 5.1 sound system.
- Good armor and weapon design
- Creative environmental changes such as gravitational change, asteroid rain…
- A rather known game content (Aliens because of unknown artifact, Doom forever)