Awesome, but needs tweaks
The game is very skillfully crafted, but I question the need of the 'stability' concept; it's nothing but frustrating. It makes sense, you're wielding balls of pure energy, but in execution it serves no purpose other then to add some unneccicary randomness to the encounters. An alternative would be that perhaps the stability could refer to how accurate they go; a higher stability rating means they go exactly where you aim, a lower one means they vary. The way it stands, although unlikely, it's possible to lose by being unlucky, no matter how skilled you are.
Otherwise, this is a fantastic game, I could see this being an awesome Nintendo DS game. Is this in AS2 or AS3?