I really enjoyed playing this game. It had a unique concept and smooth game play, and it wasn't so hard that beginners would crack or so easy that veterans would get bored. Also, I've always had a soft spot for physics games- they're one of my favorite types of Flash.
Physics were nice and game play was fun and challenging at just the right level for a Newgrounds game imo. Something I would try adding would be a weight element. There were times in the first few stages when I thought I could remove key supports and herd all the enemies to one spot and their collective weight would bust the bridge.
Medals and stuff are a nice touch, but sometimes I'll be positive that I blew up/drowned every single enemy, but it will say I'm missing some. I think it's an issue with the timer running out before the game recognizes that they're all dead.
Fun, but needs a bit of refining. I can't wait to see the next one!
Could be longer and have more upgrades for your explosives. Like a shop where you can get C4, incendiary, and the like.
Great concept here. a few more levels and maybe a variety of explosives would get this a ten.