I also experienced a similar error as weregoingkokobop but on Windows here. For me it popped up during the Hospital scene where she goes to the vending machine. Clicking ignore several times will result in the game continuing at Joseph'S so not sure how much is actually missed between the two points.
Otherwise no other problems and played through the demo. Liking it so far even if the awkward factor of the Teacher reaction had me cringing. Poor Maia.
Can't wait to see it finished.