Sure, a lot of retro games, especially from the SNES: Super Metroid, LoZ AlttP, the Mario All Stas Collection.
But also like GBA games like Pokémon RomHacks or Mario vs Donkey Kong.
But I also really enjoy playing some Portmaster games. I actually spent most of my time now playing Shovel Knight lol. But I also have fun that Sonic fan games are easily installed. I played a bit the Sonic fan game Sonic Robo Blast 2