Let's talk about the characters. Xiao Bai is a flat character. He doesn't remember anything and most of his "important" screentime is him having headaches and trying to remember his past, so there isn't much to say about him. The female lead Tongli on the other hand is a more complex and rounder character in comparison. In fact, I go as far as to say she pretty much carries this show with her motives and emotions. I feel this show is more plot driven than character development as there isn't any plot element that demands change from the main characters. If anything, I found the characters in their flashback to be more fleshed out than the present day characters. I could honestly see that as a separate anime. I also especially loved the chemistry between Xiao Bai and 夕雨 (Xiyu) in their flashback.
The music is great, one of the few occasions I'd work up the effort and listen to the OP/ED. The band's unique song "FLY" is a very catchy song. After listening to it I found myself looking for it afterwards. I also commend the use of music in this show as it really helped heighten the emotional moments in this show.
The animation is a bit tricky, a lot of people seem to not like CGI. I don't have a problem with the CGi myself, but that may be due to me being an active follower of RWBY. It isn't as unwatchable as the Berserk CGI and it isn't as good as the Ghost in the Shell CGI. It is middle-ground, but this is a romance drama show, not some action sci-fi show that needs impeccable animation. I also just love 佟离 (Tongli)'s character design, but it is probably because I am a sucker for red-hair.
I guess the last thing to say is let's wait for the epilogue in May to finally conclude this show as the ending didn't provide much closure for me.
