@purplesky similar situation but still experimenting!
I have been dabbling, mainly experimenting with none 'great on deck' games to find games in my catalogue which work and those keepers that suit the handheld nature.
One standout I mentioned is Simbin Race 07 works perfectly, only small niggle is you need a keyboard to hand to escape back to menu.
Raceroom Experience works well, slight glitch with the lighting and shadows, I hope this gets ironed out as its a decent fit.
None successes:
Simbin GTR2 fired up but I couldn't get the shoulder buttons to work for throttle and brake. Parked it for now.
Simbin GT Legends, couldn't get to start.
GOG games, I haven't tried many, One Whole Unit of Blood wouldn't fire.
DOS Steam games, Commander Keen, fired up but uncontrollable, unless you resorted to a keyboard.
Would be good to hear more about games which work well.