Among my favorite games!
I love the idea and the destructible terrain. I can already imagine a whole game around the concept. This is a really fun entry. My only nitpick, and it doesn't affect my rating, is that I think you should have the terrain destruction be a little more varied, because right now it looks like the same collision circle. I also think there should be a penalty for being in the blast zone, but as a character demo, I think you nailed it and showed what's possible.
Great entry.