You can request Sanitarium and Venetica Gold Edition from the community giveaway. Since the gift codes will expire soon, you can request them even if you're not normally eligible.
If you are eligible, the giveaway also has Beautiful Desolation, Flashback, Shantae and the Pirate's Curse, and VirtuaVerse.
Regardless, make sure to only request one game per post. Bear in mind if you make multiple posts in a row in under 10 minutes, the forum will merge them into a single post.

All Steam

This War of Mine
25GXL-3MTDD-63G8R
------------------------------
Slay the Spire
2BME5-Z433W-NC4K4
------------------------------
PGA Tour 2K21
26P66-VHWMK-H290J
------------------------------
Kerbal Space Program
27P00-W0JT2-G0ZLQ
------------------------------
Ring of Pain
27DGH-K5VK5-E3BNL
------------------------------
Crying Suns
0YKXY-7EVB5-DN4Q4
------------------------------
Popup Dungeon
20ABD-EPIHY-WTA0W
------------------------------
Wandersong
2MRG9-IEGY5-CNR8W
------------------------------
Brothers: A Tale of Two Sons
2JBHB-940Q2-7Z0P0
------------------------------
Skullgirls 2nd Encore
2TNTI-QRE25-8RHCF
------------------------------
Endless Space 2
2XPGR-76IY9-ATWPE
------------------------------
Wargroove
2M5F7-YBJTC-B82DT
------------------------------
Rustler
2G8TK-F7RTW-Y9J83
------------------------------
112 Operator
2Q2LH-9K79Y-3JJVK
------------------------------
911 Operator
2P3C7-D86Q2-T7GJY
------------------------------
Amnesia: Rebirth
2QGFN-GI8LJ-M5PAP
------------------------------
Amnesia: The Dark Descent + Amnesia: A Machine for Pigs
2HI2D-4KLM3-7Q2H0

------------------------------
SUPERHOT
2PR0F-ILFGG-AEPDB
------------------------------
Kingdom Two Crowns
2I44P-3APAZ-3XVL2
------------------------------
West of Dead
2Q5D5-6CT0A-27R90
------------------------------
Tooth and Tail
2K5PW-25HN2-LIN3Z
------------------------------
Dear Esther: Landmark Edition
2YCFD-BNYCD-E8WDC
------------------------------
Driftland: The Magic Revival
2YC73-QHFWV-G85FE

I got this one Bitsadmin.
Thank you very much for the drop, really.

By the ones I saw, This War of Mine and Driftland are taken too.

Thank you Bitsadmin, i got this one.

Thanks Bitsadmin! Amnesia: Rebirth taken, not by me.

DISTRAINT: Deluxe Edition (S-Team)

4F7#Q-#RH6A-5H79$

# feamale chromosome
$ the other gender

Sanitarium:

9A3BA-6BD84-5A397-B8BE1
D5CFD-D72B3-31DED-18991
9658A-2295F-BDDB2-514C9
33F31-B4FC9-D7F14-67E87
9D14B-7B355-D62EF-E6A8F
A7F81-39A24-CBA26-1E7EE
DDFAD-5DCA6-8DDC3-C7A96
8B5D5-22D55-2C948-3EAFE
186ED-EC9CB-22879-125BD

EDIT: All expired or taken

Venetica - Gold Edition
expires on July 12, 2022 (11:59 PM GMT) UTC+2:00

95F#E-75D92-CA5A3-199DA

# = 2 + 2 * 2
Order: 2-3-4-1

Venetica Gold Edition

11B8B-9FD3D-826CC-17A3A

A52A5-8278E-4E289-17923

777B5-F86EE-7C9C2-6C3A1


EDIT: All expired or taken

Shantae and the Pirate's Curse:

38498-A9582-CF647-55DBE

6F4A8-4C13D-51B6B-B721D

6AEF8-ECCFE-D9F5F-54178

3FB93-D36EC-DF86D-1C2E3

A7BB2-52EAF-5A955-2B12D

EDIT: All expired or taken

Flashback
https://www.gog.com/en/redeem/85B1D-24E19-51A79-6D47
(the last missing digit is 6)

Flashback™
expires on July 20, 2022 (11:59 PM GMT) UTC+2:00
?8DAF-DB78A-F2461-8376?
? - hTree

Here's another Flashback code, expires on July 20th, 2022, at 11:59 PM GMT (UTC+2:00):

79675-FFE??-3EF5E-1C**A

?? = the number at the end of "Double oh ?", twice
** = a certain brand of steak sauce

LEGO Ninjago Movie Video Game steam

JY/////////////8EC-P24////////////////V3-J4Z/////////////2R

taken by some silent ninja