It was a nice little experience. It was pretty clear what to do, nothing felt visually confusing. A few fake doors here and there, but that was to be expected from the title. Controls worked better than I thought too!
My biggest problem was the lack of music and sound after the initial section. It felt a little awkward, and made me try to get past the game faster than I otherwise would. Nor sure if that was intended, but even then some extra audio work could probably leave a bigger impact on the player.
Some eerie music or ambiental background noise would fit quite well. Even just adding footsteps or sounds when switching rooms would be a major improvement.