This was an incredibly cool game! The visuals were outstanding, the puzzles are interesting, and you got full voice acting! That takes some serious planning!
The one note I have for improvement is - I had a hard time telling in advance which doors required keys and which ones could be opened on their own. Which was fine, replaying the levels was easy and the game's clearly designed around it, but it would be nice to roughly know how many bullets I need to save for puzzle completion in advance. Unless there was some UI indication that you needed a key and i just totally missed it lol.