I don't have any music background so I can't comment on the technical aspects, but this was so enjoyable to listen to. The vocals and the music meshed well together and I like the intro with the door slam into piano into electronic sounds. The transition is gentle and smooth and lovely. The inflection on the word "down" is also good! The lowering note is clever and works really well.
The only part that felt out of place was the very ending, I think. The transition between the last vocal and the outro part happened fairly abruptly, unlike the smooth intro.
Overall this was lovely and I'm really glad I got to listen to it!