I have played this game many times since it came out. Built in the Source Engine, it feels like a cousin to Half-Life 2, with more action and fewer puzzles. It's on the shorter side, but still long enough to justify its price, and there are bonus survival levels you can play as well.

This was intended to be the first title of an episodic series, but was the only one that saw release. I would love to see more installments some day (even after almost twenty years), but that seems unlikely. I would also like to see achievements added to the game, or even a VR version, but again, that seems unlikely.

Still, a remaster of the original SIN (from 1998) is in the works, so you never know. Maybe someday it could happen.