I have a HTPC setup for steam gaming using Micro OS. I haven’t touched it in a few months, but for the earlier parts of this year I frequently played Dead Cells, Art of Rally, Bloodstained, Vampire Survivor, Stardew Valley, games like that.
I used a couple of PS4 controllers via Bluetooth, just using the touchpad on the controller for if I needed to use a mouse cursor on the desktop or something.
One gripe was that I couldn’t get MicroOS to auto login, so I had to keep a keyboard next to the tv so I could sign in everything I wanted to play a game.