Let's go to some information that can help you. We noticed some errors, however any errors that we find do not affect the continuity of the game.
On the continue button, it is sure to turn gray if: You do not reach the first checkpoint, in the case of the game, it is when you enter the teachers' room. Remembering that only the complete game has save.
One of the problems that we discover, that it is possible to climb the broken staircase, the first, as soon as you enter school. If you go up this ladder, you can walk around the map without progressing and without saving the game, however, to solve this you would have to go back to the first floor and get the book.
We are working on these errors that we found and we plan to send an update in a few hours.
Any questions ask us. :D