Some of the puzzles are fun to explore and solve. I feel some of the stealth sections are held back by the limited field of vision as you sometimes can't see where the guards are. The torch does help a little, but it drags down the pace as you can't sprint with it.
I agree that the combo lock is a little bit cruel needing to backtrack the whole dungeon to search for clues (exacerbated by the limited vision). Perhaps clues that can be found closer would be a bit more player-friendly eg number of swords on the wall in that previous large room?
While slightly frustrating in some areas, overall a solid entry! Good work!