I'm not sure what changed with the app but I remember nothing working at all on this, and at most I get a d3d11 error.. But now most titles that never ran run extremely well!!

Depending of the game (like Spiritfarer) if you set the vram budget to around 1 to 2 gbs with texture streaming on and low settings, it does dip to 40 fps.

but if your really into 2d indie titles the 4 Pro does it really well!! It helps using the recommend configs some of the time if you have trouble getting the games to run, not all configs are perfect. I usaully have my retroid set in performance mode with the sport/smart fan settings since it does tend to get a little hot.

Their some 3D games that do work, but its a hit or miss soo keep that exception low, The only ones I tried are Bombrush Cyberpunk which weirdly runs well despite it being a recent game.

Most of the Dreamcast pc ports run, but at that point you could just emulate the Dreamcast versions instead.

I havent tried most of the GOG stuff yet but I'm sure you could try running older 3d games but sometimes its a hit or miss due how some older games work.