Actually, to kill the champion ninjas you just need to max out your meteor spell and use that. It works through their cloak ability. To spam it just hold down shift. Beating level 14 has nothing to do with luck.
cute game but the way you move your characters wasn't very intuitive. it would be nice if you could have hot keys to select each character. also would be nice if you could just click and hold to speed up movement instead of clicking to select a square then clicking again to speed it up.
overall a fun game. two things that could be improved: first, camera control (it's slightly obnoxious to shoot an enemy just to have the camera pan away before you can see the damage done to him). and second, have the mouse wheel be able to fine tune your shot (like in peggle)