Most of these games are pretty cheap and are pretty much all decent, with a couple of meme game exceptions. Highly Recommended in bold.
Puzzle/Casual
- Puyo Puyo Tetris
- OVIVO - Casual puzzle game, finishable in 1-2 hours, kind of relaxing
- Portal 2
- Stax - Clone of Klax on NES
- MouseCraft - Mix between Lemmings and Tetris
Multiplayer FPS
- Hell Let Loose - If Arma 3 was WW2 and far less autistic. I refunded this once but after recent update it is a lot better.
- Squad
- Rainbow Six Siege
- Payday 2
- Insurgency: Sandstorm
Singleplayer FPS
- Hitman Blood Money
- Hitman Absolution
- Hitman 2016
- Bioshock Franchise
- Borderlands 2 GOTY
- Dishonored Franchise
- Metro Exodus
- Resident Evil 8 - Still haven't finished but it is pretty good. Kind of somewhere in between RE4 and RE7
Ye Olde FPS
- DOOM 2016
- Post Void
- Shadow Warrior: Special Edition
- Blood: Fresh Supply
Racing
- Dirt Rally 2.0 - Very fun but far more so with a wheel. On controller you will have a rough time, same with Assetto Corsa.
- F1 2019
- Assetto Corsa + DLC
- Crazy Taxi
- Flatout 2
- BeamNG
- Project Cars 2
Platformer
- Celeste - 2018 GOTY
- Super Cloudbuilt
- Garlic - NES-like platformer with great pixel art and humour.
- VVVVVV
RPG/Open World
- OMORI
- FFX/X-2 Remaster - 2001 GOTY
- Witcher 3
- Just Cause 3
- WolfQuest - Probably most interesting game in this category in terms of concept.
- No Man's Sky
- Subnautica Below Zero
- Fallout 4
- Dying Light
Fighting
- Fight Crab - Great meme game, unfortunately nobody playing the multiplayer even though it is ridiculously fun.
- Guilty Gear Strive
- Tekken 7
Meme Games
- Cuckold Simulator
- Hentai vs Furries
- Postal 2
- Broken Reality - a e s t h e t i c
- Maneater
- Postal 4
Building, Sim etc.
- Jurassic World Evolution Deluxe
- Going Medieval - Pretty promising medieval builder colony type sim. In early access.
- RimWorld
Action/Adventure
- Shadow of the Tomb Raider
- Rise of the Tomb Raider
- Bayonetta
- killer7
- Assassin's Creed Black Flag
- Metal Gear Rising
- Metal Gear Solid V
Top Down/Isometric etc
- Akane
- Hades
- Synthetik
- Ruiner
I have run out of enthusiasm for adding more detail to this list
LOL