This is - by far - the most extraordinary angel I've ever seen. In more ways than one.
What a unique story this is. Especially if you don't really have experience with that. I didn't expect something of this kind when I started. The graphics fit the surreal atmosphere very well. And they create a very unique identity for the game. The music also suits it very well, but you should really go for something royalty-free. Commercial or not, using songs without a licence is a problem.
FISH SLAP Guy has summed up my observations on the technical side quite well, I won't go into that again.
The puzzles are interesting. I had to use trail and error in a couple of places and got stuck at one point. When I used the ladder and still couldn't get up to the window, I thought the game was bugged. Luckily I saw that you replied to a comment here where someone had the same issue.
Great game. I enjoyed the time I spent with it.