This is refreshingly original. I suppose it's kind of a visual novel, but I've never seen a visual novel with this setting before. The scene has a very paranoid, claustrophobic feel. I found myself scrutinizing every passenger, wondering about their motives, trying to figure out whether I was in danger. It made me think of how frightening the job of a bus driver might be in real life under certain circumstances.
Very good art and music.
I played 2 rounds (lost one, won one), but I can't say I was able to figure out exactly how I was supposed to know who the culprit was.