I played the game itself quite a while ago and then it had just the beggining - quick talk between characters and then they go to enter the underground temple where player is trapped in the darkness. As far as i remember it was created by a writer or an artist from Twitter. Really nice 2d arts, somewhat close to Ashraely's style. Maybe it was made in Ren'Py, but i'm not sure. Thank you in advance for any help.