Thank you for playing our game! It was fun watching your playthrough and we really appreciate your feedback! There is some combat stuff that sadly didn't make it into the game at the moment, but we are currently working on bringing more content to the game.
And sorry for confusing you, black doors are openable, we just forgot to put some things in... There was one door in school hallway that you didn't try to open, it leads to a few more rooms, one of which has a key from a locked door you saw earlier in the game. Once again, thank you for playing! We'll try to do better next time!