Something like rg35xx or miyoo mini are also good for playing emulators as an adult. Eg. Take it with you on errands. Grind on JRPGs in the doctor's waiting room. Shut it off and it has a save state.
Just got myself a miyoo mini plus. Plays Tony hawk for the ps1 at 60fps which I find amazing. It's perhaps a tad small but that makes it very portable, there are similar devices if you want something bigger.