Pros and cons are down below) Check out the game here (the game is the 3d there):
Advantages:
1. The idea of the game is awesome! I loved the concept!
2. The style is very engaging. I believe that japanease school suits the concept of the game.
3. The game has different endings! Very cool and well- thought.
Disadvantages:
1. The ghosts don't seem menacing at all. Maybe it would be nice to add more of them or to make them look terrifying.
2. I wish to see more lore. What happened to the soul in the first place? Why ghosts look like normal student? etc.
3. Hints are kind of useless. You' ll find keys anyways. It would be more interesting if some of the doors would be locked with an evil spirit inside, so you'd need hints to know which doors to open (or something like that).
Overall:
A very cool game! I think it has lots of potential! I really want to see the full version of the game! Can't wait! Though, you need to be careful, so the final version would not be similar to other horror games which take place in Japanese schools! As is, I'd rate the game 4/5 because the evil spirits were not challenging at all, so it was kinda strange running around the corridors.
Hope my feedback was useful!