Oh, uh, sorry for the wait, I don't have the itch.io app so there's no way I get notifs and stuff (if those even exist), but it's a game in Roblox called "Brother's Vow" where it uses literally the same concept, except with humans, and it's a duo game. Not really a copy, I just worded it like that for convenience

(Right now the game is closed for reworks if you wanted to check it out or something  but they have a discord server)