What previous game? I only see this one on his page.
Mofu-san has previously made an turn-based strategy game called Fuuju Hime: Cursed Futana-Ring, which you can buy here:
https://tempoko.booth.pm/items/378803
This version has less aggressive censoring than DLsite.
Mofu has stated they plan to have an official English release on Steam and Itch.io, with added content and uncensored in the future.