I've had a similar problem a while back, and @randomly helped me fix the error, but it has returned once again. I tried adding the "For each" condition and "is playing Default" but it ain't working. When I kill one enemy, the others die too. So, what's the problem?
Image:

.capx:
http://www.mediafire.com/file/a4bek8adwb1e9iw/Game.capx