Game not listed

Usually, if it does not exist, it will be applied for and encouraged to be added.

1.https://www.steamgifts.com/support/tickets/new
2.ADD GAME TO LIST
3.Title
4.store link

SteamDB
https://steamdb.info/
🤔

Deep Space Derelicts: Definitive Edition

Is this the wrong name?
Search · SteamDB
https://steamdb.info/search/?a=all&q=Deep+Sky+Derelicts
Deep Sky Derelicts: Definitive Edition · BundleID: 13807 · SteamDB
https://steamdb.info/bundle/13807/
Isn't this what you are claiming?

Hi, so far I've seen giveaways of that edition of DSD that are the base game only, but normally users leave a description saying that it's the Definitive Edition. Follow Kappaking's instructions, but be aware that support may take a while to add it.

Cheers.

Support won't be able to add it if it's a bundle

We cannot add a "bundle" since they are metapackages. Indeed steam store automatically remove the price of the games you own from the total, while it doesn't if you buy a "sub". We can only add "app" and "sub". If you find a game (/app or /sub) on the Steam store, usually (not always) we can add it. If it is missing even from steamdb, we surely cannot add it.

Source - I asked them to add Just Cause 4 Complete Edition couple of years ago.

I'm pretty sure that Steam bundles cannot be added to SG, but you can still try to request it.

Options are to wait to find out if it can be added (unlikely), giveaway as the base game, or giveaway as one of the DLCs.

Edit: Beaten by vot4ol

I asked for some games to be added more than 2 weeks ago and still not heard anything so don't think it'll be done quick if at all