- Goddamned Bats: The spiders.
- Polished Port: The console versions. Instead of using the Build engine in the console ports, Lobotomy Software instead developed and used the Slavedriver engine for this game (as well as the Saturn version of Quake and Duke Nukem 3D) for the console version. At the small expense of texture quality, the game gained better 3D movement along with faster and smoother gameplay. The game was given more much open-ended gameplay, along with more weapons and abilities to discover, making one of the earliest Metroidvania first-person shooters long before the Metroid Prime series.
YMMV / PowerSlave