I must have recked the trigger points, but as far as I saw there were some valuable changes you could make. First of all, I really like the art style/aesthetics of it. A well-deserved 4 on emersion for it. It would be a 5, if it weren't for these last notes : The gameplay felt really slow. The phone rang far too long while nothing happened, so I just left the room. Also, there are no control hints. There should be some UI (whether over the interactable or on the player's screen) indicating what to do. This would improve a lot. As for Audio, it was really good as well.
You should definitely update it. I see a lot of marketability here.