Things I liked:
The game is story driven (imo plot is always more importantthan romance)
Art (both background and character artwork are very beautiful. A special thanks for giving your characters a more realistic facial features. It's such a breath of fresh air compared to the usual triangular/dot-like anime noses)
Morality is an interesting feature and i'm curious how it'd influence the story later.
Things I didn't expect:
I didn't look closely at screenshots before playing so when it turned out angels and demons were involved i was really surprised since apocalyptic themed games are usually rather realistic and they don't involve supernaturals. Ofc it's not a bad thing per se just very unexpected.