My biggest complaint thus far is just the implementation of background flying enemies. They seem to add nothing but frustration to the combat. The Cherrups usually require their shields (which respawn by the way) to be pulled from them before they can be attacked, and can cause quite a bit of confusion for the auto-lock on system.
Also the Harpies make loud shrieks constantly, whether attacking or not. I can't tell the 'I'm going to attack' shriek from 'I'm just hanging here' shriek. Annoying.
Otherwise, still pelting the demo. I've racked up about 13k Red orbs, and 63 upgrade points. Pretty much can guarantee an SSS every run on SoS Under Watch.