They were, but they had a dispute and now Lipstor has been trying to get revenge by getting the game pulled due to arguing that Mofu has stolen their characters (they didn't steal anything). 16may61 is possibly an alt account of Lipstor trying to pass off as another person who's been harassing Mofu-san on PixivFanbox, as well as this site, for most of this year. Their account got suspended on both sites due to harassment.
This is infuriating , I ve seen Mofu developing the game with his help , normally Lipstor would translate stuff , and now he comes against him harassing him , now it seems he was doing it to get any argument to use to get possesion of the game and now hes trying to pull out the game from the side because maybe he cant get hands on it, sometimes people can be dogshit and take advantage of you, I indeed noticed him picking on Mofu for no reason but anyway, I didnt thought it was bad to come to this point, well all in all I hope it goes well for Mofu , I ve been passively waiting for updates and its pretty nice aslong Mofu keeps updating sometimes, doing games is pretty time taking and I totally understand cuz people have their lives, well I hope it goes well for him must be pretty exhausting to deal with this type of people.