Step 1: Get a big enough vehicle. Step 2: Get it on the surface of the planet. Step 3: Drive straight, thus destroying everything as you pass.
If they couldn't do something like this, I would at least like to see some kind of breaching charge, that made a very small hole in the surrounding area, just big enough to make a hole for the player to fit in.
I smell traps abrewing! Lovely idea friend. Making an arena would be awesome with it. Only one question, what if you knocked a lower block off would they all fall? or if it had a background wall, would it be held up?
*spams newly created castle with glow-sticks* Momentum? Heck yes! Trollin' from above, I can see it now. Serously though, momentum would be sweet. Haven't seen something like that in a 2D game yet (don't judge me, I haven't played too many).