Hmm
Not so bad. Surely it needs more work, but it's OK. There is a bug, as you can see. While you shoot, something appears in the top left corner. My friend was making a game, in C++ not flash, and it had exactly the same bug. Bullets weren't destroyed after hitting a target or an obstacle, or simply leaving the screen, and they were dumped in that 1x1 pixel. Nice for a start.