This definitely kept me on edge the whole bus ride, I kept expecting a lot of horrible, scary things to happen. I love these games built around otherwise mundane, normal environments that are just slightly off in subtle ways.
I'd liked to have seen a little bit more actually occur on the trip, though. It's not bad to have a minute or two of down time to build tension, but it got to a point that I missed the one scare that was in the game because I was trying to make something happen. For a first time game, this was really solid and lasted just as long as it needs to; I'd like to see you try to balance out the tension and the spooks a little more in the future.
Keep up the great work and I can't wait to see what you make next!