Super Mario World 2
Any Pokémon before Crystal
Pokémon Trading Card Game for GB
I'm not exactly sure how the storage and file system works on that device but I'm assuming you load ROMs onto a SD or something. So for example you can torrent a zip file of ROMs for every SNES(and the other consoles listed but I'll just to math for SNES here, but I can't imagine the other are massively different) games is like 2 to 3 GB and unzipped 4.5 to 5.5GB, so assuming you have the version with 64GB storage you could feasible be able to get a ROM of every game for every platform you listed on it. Still good to get recs though as you may get 'choice paralysis' but if you can why not so you have the option if you get bored of whatever recs you get/play