This is one of the best episodes of wish fish I've seen so far. Don't get me wrong, I liked fish in a barrel, but this episode goes above and beyond in terms of animation and writing.
One of the most noticeable improvements from earlier episodes are all the small details, like the trash and stains on Harold's shirt or the detailed backgrounds such as the alley.
It was a great idea to collaborate with Rob, it was a huge surprise and was really well done.
The cliff hanger makes me excited for episode 20, I can't wait to see the weird looking bastard child. Keep up the good work!