Pico-8 supports two controllers, so that's why you can find references to second controllers in the menus. Sorry to disappoint you but there's no two player in the game, unfortunately. I did consider it but ran out of time (and token space!) :)
Is there any plans to add it after the fact? As it is a known point that some dev after a game jam do get updated for QOL or feature reasons after the fact.
