1. I can confirm that skeletons don't attack green ones. It was hard to check (since skeletons very like my guy), but I could see situation when two of them were standing still and green ball was killing them.
2. Clicking is not the issue. I had some time while watching a TV series at the same time :P. So I thought "why not?". :D
3. So it is not a bug but an exploit! ;)
Anyway, I have to say big "thank you" for your work. It is great! And I can see that the game is still under development, which is not a very common situation here, on this platform. Hope you will find a way to develop it even longer :).