Aaaaaaahhhhhh it's so pretty! I don't even know much about this game, but as usual, I clicked on this because of the pretty colors :)
This is really well done. You made a great use of... I believe it's called negative and positive space, where you only have filled-in space and space that isn't filled in. Only thing I'll say is there's a few parts where I can tell you used a bucket tool - there's thin black lines that separate the line from the filled-in area. That's a tiny nitpick, though. Very pretty in a dark way, very dynamic.