Not bad, but not the best.
I like the idea of the game, blowing up everything, and it's definitely great for your first flash game! You look like you've got lots of potential as an animator :3
You might want to change up the graphics, they get a bit old after a while, and change the music for every level. Also don't give a player a button to continue until they beat the level, and make it a bit more obvious; it took me a while to find.
Otherwise I really enjoyed playing it, surprisingly, because usually first-time Flash animators aren't this good! ;)