Open-Morrowind my bro

Duelyst II is a fan revival of essentially a Hearthstone clone played on a chess board. It's still in it's early stages, but it's fun and promising.

Muck is a roguelike survival. It's got kind of a silly TWAB vibe. It's fun to play with friends but you don't have to.

TF2 is a casual FPS, as you probably know. It still holds up. I'd recommend playing on custom servers.

Emu🦢lation.

Free Roguelike Games for low end pcs? Where do I begin with this one? There is Dungeon Crawl Stone Soup, Angband, Tales of Majeyal, ADOM, Cataclysm Dark Days Ahead, Unreal World, theres a lot more than that but those are the ones that come to mind.

While not free, I’d suggest getting Terraria on Steam, play through, then switch to TModLoader. You can expect a 1000+ hours easily. You could pirate it, but the devs really deserve your money on this one.

Honestly, a GamePass Ultimate membership for cloud gaming would be a decent idea. I use mine on low-end PCs (with a controller) and it’s been great for the month or so I’ve been using it.