At first I thought it was a rhythm game, since it felt like the papers were showing up when I clicked on them, but then I noticed that one would simply show up after I picked up an other, so there were always the door's number of papers available to click. It allowed for some strategy, so I could wait to pick up some, if there was a convenient cluster of them elsewhere. Also felt like a rhythm game cause the music is really energetic. It got my head bobbing.
Entering the door passcodes was satisfying too. Liked finding the bit of lore found right before an unexpected end.