Sorry to hear that you got stuck! Do you mind if I ask which room it was that gave you so much trouble?
For me, a "filter" (if you will) has been pulled over my eyes from the many games I've played on here. That filter being to ignore typos, because many games I've personally come across have them (even this game, later on in the game where I think the term "no loner" is used instead of "no longer").
*Possible spoilers for the metal box puzzle below*
I originally thought, I had to click the buttons in a certain order.
I wish there was some sort of indicator letting me know I had a key. Like one of the slots highlighting when clicking a button. I was stuck for about 80 minutes until I found out by randomly clicking the screen that, clicking a button gives you a key while on that puzzle, and that the holes at the top are the key slots. I thought those holes were normal and from my characters POV, they were just seeing the inside of the safe because of the depth/way the light shines.
I had to stop at the multiple staircase/holes-in-the-floors parts, but I think over all the game/graphics/atmosphere are pretty good. It's just a few UI/HUD things in the puzzles would help.
Thanks for the game :)