Hey, this is a simpler version of griffpatch's amazing health bar. It has only two costumes! :D Instead of using two costumes for a full bar and an empty half bar, I just use one "full" costume, which I mirror each and set the brightness to -100 for an empty bar. In order to be able to mirror it, I had to change the costume a bit and therefore always move the half-bar half-a-width.
