Yeah, the answer to all of your questions is that we screwed up. We let the development of the house last and didn't have time to truly finish it.
The last room was supposed to always kill you, but then a cutscene should have played where it showed that you were just a toy to the entity controlling you and they always killed you and put you at the start of the game, starting another loop all over again, showing that you really didn't have controll how you play the game. But of course we screwed up that too.
The inventory, I have no ideea why it is deleted, it shouldn't. But at least they aren't that important. The first part was just a little tutorial anyway.
About the windows, the ideea was that you jumped out of them, but, and now say it to me, we screwed that up. The screen where it explains what killed you isn't playing correctly. Of course, you shouldn't have died by jumping from the ground floor. The house was supposed to be more trippy, where you enter a room on the second floor and you find you are suddenly on the 10th floor or on a skyscraper, but...
The "calm" mechanic, true, is unbalanced as hell. You shouldn't be able spam it.
And the flash light is kinda shoehorned in. I have no ideea why it was implemented tbh. I woke up from a nap and here it was implemented by the others. So I had to at least make it work.
There should have been 2 keys and 2 blocked doors, one that was with the gun and the other with the flashlight. It is possible that we screwed this up too. I also forgot to add an enemy guarding the flashlight key.
This all is to say is that we screwed up big time. We created all the mechanic independently and when it was time to put them together all broke.
Thank you for the feed back and I'm sorry you couldn't play our vision. We tried.