Like more than one of them
20 games close to two or more of Voidigo, Left 4 Dead 2 and Garry's Mod
SCP: Secret Laboratory
Left 4 Dead 2, but free to play
Loved · 91%FPS · Survival HorrorAlso like Garry's Mod
No More Room in Hell
Left 4 Dead 2, but free to play, and half the hours
Loved · 90%Zombies · SurvivalAlso like Garry's Mod
R.E.P.O.
Garry's Mod, but a survival horror game, and a quarter of the hours
Loved · 96%Physics · ComedyAlso like Left 4 Dead 2
Content Warning
Garry's Mod, but a horror game, and a tenth of the hours
Loved · 94%Physics · Online Co-OpAlso like Left 4 Dead 2
Roboquest
Voidigo, but faster, and co-op
Loved · 95%Action Roguelike · Bullet HellAlso like Left 4 Dead 2
Ravenfield
Garry's Mod, but single-player, and a third of the hours
Loved · 97%Sandbox · FPSAlso like Left 4 Dead 2
Gunfire Reborn
Voidigo, but co-op, and three times the hours
Loved · 93%Roguelike · Action RoguelikeAlso like Garry's Mod
Counter-Strike Nexon
Left 4 Dead 2, but free to play, and PvP
Mixed · 67%Zombies · FPSAlso like Garry's Mod
Death Road to Canada
Voidigo, but a survival game, and with zombies
Loved · 93%Action Roguelike · Local Co-OpAlso like Left 4 Dead 2
Serious Sam 3: BFE
Garry's Mod, but a boomer shooter, and a tenth of the hours
Liked · 88%FPS · ComedyAlso like Left 4 Dead 2
Zombie Panic! Source
Left 4 Dead 2, but half the hours, and more divisive
Liked · 85%Zombies · FPSAlso like Garry's Mod
Serious Sam 2
Garry's Mod, but a boomer shooter, and gorier
Loved · 90%FPS · ComedyAlso like Left 4 Dead 2
Unturned
Left 4 Dead 2, but a survival crafting game
Loved · 91%Zombies · SurvivalAlso like Garry's Mod
More like Voidigo
5 games closest to Voidigo of your picks
Enter the Gungeon
Voidigo, but co-op, and three times the hours
Loved · 95%Bullet Hell · Action Roguelike
HELLDIVERS
Voidigo, but not a roguelike, and twice the hours
Loved · 90%Twin Stick Shooter · Top-Down Shooter
Nuclear Throne
Voidigo, but post-apocalyptic, and four times the hours
Loved · 96%Action Roguelike · Bullet Hell
More like Garry's Mod
5 games closest to Garry's Mod of your picks
Scrap Mechanic
Garry's Mod, but a survival crafting game, and with base building
Loved · 92%Building · Physics
Hot Dogs, Horseshoes & Hand Grenades
Garry's Mod, but in VR, and half the hours
Loved · 97%Physics · Sandbox
Fireworks Mania - An Explosive Simulator
Garry's Mod, but a hobby sim, and 3D
Loved · 97%Sandbox · Physics
How this list is made
Each game is measured against each of your picks the way a games-like list measures it: the Steam community tags, Steam genres and IGDB themes they share, each counting for more the fewer games carry it. A game's place is how alike it is to your picks together, as a share of each pick's best match, so one alike to two of them comes before one alike to just one. It must be close to at least one of them, as close as it would have to be on that game's own list.
None of your picks is on the list, nor a second release of one, nor a game of their own series. Up to 30 games are shown. Under each name, the kinds it shares with the pick it is closest to, and how it differs from that pick.