if you can still find the deb-ified webos games they give you a modern mobile phone game experience, at least the ones which do not require multitouch; though I think there was a workaround even for htat.
Muppen64 lets you play lower power Nintendo64 roms I had Mario64 run great and is well suited especially if you find a game-gripper attachment somewhere; if you search thingiverse I even gave a feeble attempt to 3D design & print a FOSS game gripper like thing.
Mupen64 does almost all of the work for you except finding or extracting the rom files from old game carts.
There is a NES emulator if you want to play super maro brothers.