XSp.

Very interesting game that kinda reminds me of Motherload (the design part at least):

Holy Invasion of Privacy, Badman! is a game with an interesting concept that’s coming for the PSP.
You are actually the villain, and you must dig your way into the ground setting up monsters and obstacles so the hero doesn’t get to you.
It’s gameplay is very similar to Tower Defense-like games.
Oh, I must say I love the hero sprite… it’s very similar to the ones in Dragon Quest games! xD

Souce: Kotaku