Stuck on 7th level

I’m totally stuck on this dandori challenge. 1 min to kill all of these buggers?!? I’ve replayed it about 100 times now and still can’t quite make it in under a minute. Any tips??

I’m totally stuck on this dandori challenge. 1 min to kill all of these buggers?!? I’ve replayed it about 100 times now and still can’t quite make it in under a minute. Any tips??