Awesome, perfectly fits the theme and fun to boot! I found a small bug where if you change your direction, you can "dive out" of the wall, but actually be aimed into another wall. Then you can "dive in" and be hidden outside the walls. In the screenshot I was originally inside one tile down and one right, I aimed up, pressed X, then quickly switched my aim to the top-left.
Also, it's possible to get stuck on the early stages since you can dive into the floor but can't aim up to get out.