It is based upon NetImmerse from what I know (looking at the models, which use NetImmerse File Format, Version 3.3.0.13). Strangely a lot of the scripts in the game are easy to read or in XML, and I guess someone could go in and edit the AI scripts and make the Sligs shoot each other when they hear the player. Good for a laugh.
Oh, and there are UI images for a coop mode (something that really should have been in the game, but I'm willing to bet isn't possible).
Also the sound folder is called 'oddio'. Harharhar.
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