I'm really glad you liked it! A lot of early-mid 2000's websites inspired it (Homestar Runner is great) and I've been using Flash for a long time, so I felt like there wasn't any reason not to just use it for the art and animation given the style I wanted to go for.
Mitzi isn't over yet, I've actually been working on a new minigame this week where you control Mitzi exploring Lily's apartment. I've been fleshing out some ideas for another quest, though. It's less light-hearted and silly but still has the same general style that Mitzi does. When Mitzi ends I'll probably make an end screen like the one in Problem Sleuth so people aren't left wondering if it's really over or not.
Anyways,