You are asking for Borderlands 2, friend. You're in for a grand adventure.

• Overcooked 1 & 2
• Unrailed 1 & probably 2
• Slay the Spire 2

Don't Starve Together

I think there's actually a lot of games that fit all of those?

What genres do you play? Shooters, survival games, RPGs, sandboxish...? Might narrow down some ideas.

Mindustry is free, low spec, runs on linux, has a campaign - its a factory + tower defense game

Try gambling with your friends

so I went back to playing star trek online and champions online from cryptic. they are from aroudn 2010 so pretty easy on hardware. you can play together although you may have to do tutorial along although I think with champions if you play at the same time I think you are in the same instance and can play together. I know champions is eventually skippable for an alt but not sure if you can skip from the get go.

Steam search is being a little less helpful than I'd like, but

• It Takes Two / Split Fiction
• Operation Tango
• Timemelters
• Lords of the Fallen

Are all games I've at least heard of before that all have a friend's pass, so only one of you would even need to buy the game

Absolum

Kingdom Two Crowns

Elden Ring?

Pathfinder and D&D run on a telephone and a handful of dice. And the zombies are optional.

Real talk, though, I'd have to second the recommendation for Starbound. It has tons and tons of mods, and it runs just fine on Linux.

Halo.

Unless you count the flood as zombies? 🤔

Top of my head.

Trine Series (2 specifically), Terraria, Minecraft or Luanti, Risk of Rain, TF2 MvM, Don’t Starve together, DeepRock Galactic, Torchlight 2, Sea of Thieves (Custom seas), Zero-K, SarCraft 2 co op, Shadow Warrior 2, Crime Boss Rockay City, Payday 2, Gauntlet Slayer Edition, E.Y.E Devine cybermancy, Battle Block Theater, Magicka, Monaco, Cult of the Lamb, Vermintide.

Baldurs Gate3 Absolum Streets of rage 4

All the action roguelikes seem to fit

Starbound! I fucking love Starbound.

Core Keeper might fit the bill. Very similar to Terraria, but closer to isometric instead of a side scroller. Randomly generated world divided into staggered biomes with handmade "scenes" spawned in to add interesting things to find.

Maybe Mechabellum could be something

it is an autobattler like direct strike from starcraft, easy to pick up, hard to master though

also.. V Rising could be something for you (isometric action hack and slash with building an crafting)

and if you dont mind "overwhelming" systems in the game, warframe could be fun too

There’s a game I’ve seen a lot of YouTubers starting to play over the last week or two that looks a lot of fun - Mecca Chameleon

Online multiplayer. One person is hunter, others are hiders. The twist is that you can paint your character. So you find a hiding spot, and then paint yourself to blend in to your surroundings

I don’t know if it’s what you’re after, but it looks like a lot of fun