Hi, I've known about a popular character's game for years, but it was released as PSP DLC only in Japan and is now owned by LostMedia. My question is, if they were to recreate it based on the information available about him, adapting it to what the jam asks for, would it count as an entry for the jam?

Go for it! Until Mark replies saying otherwise, I'd say go for it.

If its lost media go for it ig! As long as it fits into the Jam I'd say ok