Keep That Princess HERE! [Incomplete]

You are a big bad guy. You got a big bad castle. And you got a big bad princess who wants to be rescued. Your job is to keep here in your castle. Easy enough, right? Try it yourself!

=== Post WGJ Update ===

Sadly I got various real-life topics that basically cause me to abadon this project early on, so this is just a prototype, I'll upload the source to GitHub and provide a link here later on.