I only had a few small problems with the interface when playing with a chest lock. That was on the downside ;). About the ending of the game - I thought it's the part of the experience "when light went down" so I had the thrill moment anyway :).
Atmosphere is so great, reminds me somehow Nomad the Omikron Soul (probably also because of the BGM) where I had the same feeling of just hanging around in a room, checking some items, playing music and just being in a place, in a game world :).