I'm really glad you enjoyed the little dialogues I put with each box and that you found the number of puzzles nice! I don't play a lot of FPS, and the crouch jump sounds interesting so if you don't mind, could you describe it a bit? I think it could be an interesting mechanic for future games or this one if I ever go back to it after the jam.
So in mainly the older FPS games (particularly those made with Source and GoldSrc, as well as some older idTech engine games) players could gain extra height to their jumps by crouching mid-air. Kinda like one does IRL by jumping and tucking in their legs.
And the same thing worked in your game. Jumping and flattening the character mid-air let me climb higher and get into places I wasn't meant to get to.