I found a bug that if you aim right after going through a door you can't use the action button (open doors or go through the stairs) and enter in any menu (the inventary or settings) but you can still walk and shoot.
The only way I found to fix it was to try go through the stairs, and then I was able to open the menu again, but if you go to a room without stairs you'll have to re-open the game because you can't open doors.
(I had to re-play it 2 times but was able to find the cause of the bug)
There is a bug too that you can't configure the walking buttons (I wanted to use wasd to walk)
Really liked the game, keep it up.