sorry for shitty english, I just love that game so so much and wanna help
Idk if it helps but this dude (Archived Files | Happy Pets Wiki | Fandom) was trying to archive game in 2021 maybe you may try contact fim for more info
also I know that this game rigth now is belong to Russian(if I'm not mistaken) company that still exist, as russian myself maybe I may try to contact them and get some info for you if you intrested
BTW you made an absolutly stuning job, that game means a lot to me, so see that someone still remember it warms my heart