The pixel art is really pretty, and the candle lighting in particular looks awesome; it adds so much mood. The music fits perfectly too, that melancholy vibe fits the world and story really well. I also loved the little idle animation details on the character (coat/hair moving a bit), small thing, but makes it feel way more alive.
The one-door-different-room concept is such a smart jam idea. It lets you do a lot of interesting puzzle/exploration without needing huge spaces, and it never felt like pointless backtracking. The little text hints were a great touch as well (the bolding of keywords) , super helpful without being hand-holdy.
There is a lot of atmosphere in this game. Felt really polished and well put together.