omega64: Considering those are not sold here I would need to rebuy the game on Steam and then buy the dlc. I doubt it can be argued that's not treating me poorly. :P
Sure, it's bad. That is, if the soundtrack can only be obtained on Steam and not some other store like Bandcamp.
Anyway, now that we had the 200 games milestone, let me make some contributions to reach 300.
Hotline Miami 2 is also missing its soundtrack.
The first
Little Big Adventure is available on Steam as a bundle with two versions; the mobile port and the original DOS version for the same price as the GOG one, which only has the DOS version.
Finally, I see that Advent Rising is listed as "unconfirmed" in the sheet, regarding the soundtrack. Truth be told, the soundtrack didn't launch on May 15 2010. Instead, it was added years later, March 29 2018, to be precise:
https://steamcommunity.com/games/3800/announcements/detail/1656636766761803499