I've hoarded a bit of keys in the last few months to give them away for my birthday, just to be silly, but I was without internet, then I thought I could make it for easter but I couldn't, then I forgot. Now enjoy those poopy masterpieces:

https://www.steamgifts.com/giveaway/IiD6e/drive-megapolis
https://www.steamgifts.com/giveaway/XBm4N/eaten-alive
https://www.steamgifts.com/giveaway/enk2o/escape-machines
https://www.steamgifts.com/giveaway/kCOUg/final-quest
https://www.steamgifts.com/giveaway/N1EqG/final-quest-ii
https://www.steamgifts.com/giveaway/qFBEf/germ-wars
https://www.steamgifts.com/giveaway/5yAGL/flesh-eaters
https://www.steamgifts.com/giveaway/jq74d/joanas-life
https://www.steamgifts.com/giveaway/m68yA/hyper-color-ball
https://www.steamgifts.com/giveaway/wYM8Q/kivi-toilet-and-shotgun
https://www.steamgifts.com/giveaway/gsMZo/laraan
https://www.steamgifts.com/giveaway/oAiE9/lup
https://www.steamgifts.com/giveaway/jyKOo/monster-puzzle
https://www.steamgifts.com/giveaway/Xgzus/midnight-carnival
https://www.steamgifts.com/giveaway/bpbd6/new-kind-of-adventure
https://www.steamgifts.com/giveaway/XbQRm/neon-hardcorps
https://www.steamgifts.com/giveaway/bQpgr/or
https://www.steamgifts.com/giveaway/Ez24O/project-druid-2d-labyrinth-explorer
https://www.steamgifts.com/giveaway/Xdob3/spikit
https://www.steamgifts.com/giveaway/ZiO88/shape-shifter
https://www.steamgifts.com/giveaway/m5ROE/star-drifter
https://www.steamgifts.com/giveaway/xhzWP/star-chronicles-delta-quadrant
https://www.steamgifts.com/giveaway/hP7Te/star-fields
https://www.steamgifts.com/giveaway/abgzN/stellar-2d
https://www.steamgifts.com/giveaway/MsMbR/super-mega-neo-pug
https://www.steamgifts.com/giveaway/fSru7/stone-age-wars
https://www.steamgifts.com/giveaway/xIxAj/super-space-pug
https://www.steamgifts.com/giveaway/24CuQ/the-land-of-dasthir
https://www.steamgifts.com/giveaway/s5CIs/terra-incognita-chapter-one-the-descendant
https://www.steamgifts.com/giveaway/sLQgG/the-tower-of-elements
https://www.steamgifts.com/giveaway/UXR6W/town-of-night
https://www.steamgifts.com/giveaway/z3ib1/tinboy
https://www.steamgifts.com/giveaway/ergrV/turbo-pug
https://www.steamgifts.com/giveaway/CMePS/turbo-pug-3d
https://www.steamgifts.com/giveaway/7oFdU/warriors-of-vilvatikta
https://www.steamgifts.com/giveaway/O9Xz2/turbo-pug-dx
https://www.steamgifts.com/giveaway/gXpIK/desolate-wastes-vendor-chronicles
https://www.steamgifts.com/giveaway/VaQFq/state-of-anarchy
https://www.steamgifts.com/giveaway/Or4H3/fall-of-civilization
https://www.steamgifts.com/giveaway/JJuL6/atonement-2-ruptured-by-despair
https://www.steamgifts.com/giveaway/2i733/city-of-chains
https://www.steamgifts.com/giveaway/eYprU/reset-1-1
https://www.steamgifts.com/giveaway/CBqZu/incitement-3
https://www.steamgifts.com/giveaway/OWOsI/outrage
https://www.steamgifts.com/giveaway/m5txt/purgatory
https://www.steamgifts.com/giveaway/xw9eK/the-dreamlord
https://www.steamgifts.com/giveaway/WyFUp/radical-spectrum-volume-1
https://www.steamgifts.com/giveaway/aXdtM/pulsecharge
https://www.steamgifts.com/giveaway/VxfzD/invasion-brain-craving
https://www.steamgifts.com/giveaway/6CsSf/insincere
https://www.steamgifts.com/giveaway/b81zQ/so-many-cubes
https://www.steamgifts.com/giveaway/av4CV/clash-legacy-pack
https://www.steamgifts.com/giveaway/rPZ94/elements-soundtrack
https://www.steamgifts.com/giveaway/ogumQ/project-starship-ost
https://www.steamgifts.com/giveaway/8rXBN/12-is-better-than-6
https://www.steamgifts.com/giveaway/vjkDL/cosmic-dust-rust
https://www.steamgifts.com/giveaway/RmwgG/game-corp-dx
https://www.steamgifts.com/giveaway/OIlPm/calcu-late
https://www.steamgifts.com/giveaway/ok1cq/tricky-towers
https://www.steamgifts.com/giveaway/tzxaY/drayt-empire
https://www.steamgifts.com/giveaway/s9DHI/ampersand
https://www.steamgifts.com/giveaway/pkplv/precursors
https://www.steamgifts.com/giveaway/1smwa/deep-space-dash
https://www.steamgifts.com/giveaway/YiHA2/1-ride
https://www.steamgifts.com/giveaway/STxyp/clergy-splode

Less poopy ones:
https://www.steamgifts.com/giveaway/i7aX9/attractio
https://www.steamgifts.com/giveaway/LnK3X/windward
https://www.steamgifts.com/giveaway/XS2Wq/ziggurat
https://www.steamgifts.com/giveaway/uXpKF/steamworld-heist

Random keys (replace the word with the number):

• Catch a Falling Star: PD95E-LC59A-YCDP(five)
• Freebie: VGQ28-WAPXZ-MHK2(zero)
• Super Mustache: JLLAT-(zero)HYT3-DPMKE
• Project Starship: K2Z3(four)-FVAGV-QGKHP
• Dungeon of Zolthan: CX9FI-KZI78-E(six)YWI
• Elements II: Hearts of Light: 8J8K2-57BDY-F7(five)KQ
• Broken Dreams: JFCF6-T85B(zero)-HCHIX
• Atonement: Scourge of Time: (four)QDWF-ZQJCI-BQJZA
• Data Hacker: Corruption: (two)4KKY-2X3E0-K4XWA
• Data Hacker: Initiation: H9A5F-NIM82-689L(two)
• Data Hacker: Reboot: M4NJR-(eight)4CBI-BFPDF
• Elements: Soul of Fire: P4KML-Q2L28-GJFV(six)
• Dead6hot: QIKIL-JH5CI-(nine)RXQ0
• Hero Quest: Tower Conflict: YNVHB-0A038-IANY(zero)
• Rabiez: Epidemic: TVPGR-ERWG7-T(five)6WN
• Guardians of Victoria: 5BQXB-8T2LV-GAM(zero)X
• AI: Rampage: 5EL5A-8JK4D-PDI(four)V
• Data Hacker: Reboot - Game Guides and Art Book DLC JYPPN-(four)JHXQ-MYXAE
• Data Hacker: Reboot - Soundtrack DLC: (seven)QX24-AMCYI-GYKLD
• Data Hacker: Initiation - Soundtrack DLC: 88G3H-4EQNI-BKC(nine)V
• Data Hacker: Corruption - Soundtrack DLC: X4837-FMLZ5-KD(two)EP

Adding 2 more, sorry if the others are already taken, I've tried to strike the ones people have claimed in the comments:

• Asteroid Bounty Hunter 5MMED-8TC7A-CBRX(fiveeeeeeeeeeeeeeee)
• ShipLord RWIV5-68ZQ2-7E0(foooooooooour)P