Thanks for the detailed feedback, I'm glad you like the game.
I should have added an option to disable the wobbling. You got everything right about the things which could deserve additionnal feedback.
Items are indeed all placed, without any visual clue and even the feedback for getting items is only a barely noticeable sound, which should be louder, and when what you found is a weapon then a New weapon message under the Change weapon command which stays there until you use it but I should at least have put it in the middle of the screen, there was no reason not to put it there.
There's indeed a pair of teleporters which bring you forward into the corridor with a some piles of items hidden there (if you get back and also via a hidden door between the two).
The fourth floor is a bit of a difficulty spike. There's one more floor after this one.
I like our similar implementation of the themes. Azerty is a curse when making games, there's always something I'm doing wrong.