I can whole-heartedly recommend setting up a zandronum (doom) server with Brutal Doom installed for a really fun classic-but-up-to-date FPS experience, I played this regularly with friends for years and we weren’t even born when doom came out, it genuinely is awesome.

I’ve installed Jebroa but it seems to be a bit fucky for me, (Pixel 6, GrapheneOS ROM which probably doesn’t help), hopefully it gets better with time. Gonna give thunder a go