I've noticed that the game "Hands of the Killer" by garmentdistrict is missing from GOG Galaxy's database. Weirdly, the rest of their "of the Killer" series is present, and all of the games have entries in IGDB, which it's my understanding that GOG pulls from for its database. I'm hoping there's some easy way to rectify this so that I can add the game to my library.

I made a small update to this game in the IGDB as it was missing the release date for the PC version. Technically this shouldn't have mattered, but this edit should force a refresh essentially if approved.

I've noticed that when a game is newly added to the IGDB, it will show up in Galaxy almost immediately. When it is necessary to edit a game already in the IGDB, it can take 24-48 hours from the time it is approved to show up in Galaxy.

It's there now! Wonderful, thank you for your help.

You're welcome. If there's any other game missing, you just need to check the IGDB here -> https://www.igdb.com

If it's already listed, try to find anything to edit no matter how minor it is to force Galaxy to refresh its database and find it.