Wow this is so good, love the art style, love the sound, love that it really make me want to know more about the story, what happened to the group, why is it suddenly turning so suddenly, oh I want to know. I think this game really has the potential to be a much larger game, with that mysterious and slightly intriguing narrative, it surely makes a good premise to be a good visual novel or choice matter game! Good job!
Only criticism from me now is that the game is a bit slow when not talking. Things like text speed, skipping text by just pressing (not only on the dialog box), movement between rooms, etc would ideally make the game feels more snappy and reactive. Hopefully that would not make the game too short though.
Anyway, well done to you all!