Scratch

I have been making an RPG for the last few hours and somewhere along the way I managed to mess up.

Basically there is is blob sprite which you fight with a variable called enemy HP. When this is under 1 then "Well done, joo killed him" is broadcasted, changing the background and the visibility of sprites. For some reason when you press the green flag the variable is set to 100 (meant to happen) then changes to -6 making the game unplayable (there is some stuff before the fight)

Please help I need the answer in under 1 hour PLEASE!

The game is here: http://scratch.mit.edu/projects/Skatch/1594831

Please download it and have a look.