Some things in the investigation that are really interesting never get brought up again. The villain's motivation is kinda odd and the conclusion is insanely abrupt?

The music, VA ,visuals and characters are mostly excellent here.

Edit: After some retrospection, I've bumped this up a notch. Solely for the fact I thought about Penelope's motivation more. She kinda got what she wanted in the end; she got to be free of Tangle Tower and can't return to it.