Since it can instant dismembering an enemy and so making him completely useless in combat I think so. You can simply cut through anyone and then stab him....this way even the pain thing (Which is guess you added to tone the power down) would be ignored!

I mean you have a sphere where you can control everything inside. Meaning attacks entering the field can be thrown back and people inside would find themselves or rather their body parts shattered all over the ground! It isn't even fully explained in the OP lore and so....just ehhhh well I find it certainly over powered!

If you look at FT even a sphere with full Gravity control is troublesome enough to put Gildarts down and a certain female mage is putting up quiet a show by just altering her weight. You sphere allows many many more....