Nathan Stockton's "Create a platform game"

I’m new to flash gaming, and I’ve been using your so far amazing code to work my game, but now I’ve hit a few hitches:
-the bullet does no damage
-the scoreboard/health bar don’t work right, instead of adding 1 to the number in the text box, aka from 100 to 101, its goes from 100 to 1001, adding the 1 to the end of the number
-when i kill 1 enemy, all of them die simultaneously
-there is no way to restart the game when i die

I can’t just download your .fla because i only have flash mx, not mx 2004.

Sorry if these are all answered elsewhere but I’ve just gotten a tad frustrated. Any help would be great!