I'm glad you had a good time with it! And don't worry about Mongrowl, it's a boss battle so you actually can't catch it.
The girl is supposed to have updated dialogue along the lines of "Thanks for bringing back Mongrowl! I know he can cause quite the mess, but he really is a good boy", but I wrote the code to check that condition less than 10 minutes before the deadline so I didn't test to see if it worked. Whoops!