I think the shooty enemies shoot too much, if you want to kill them you have to give up on doing anything else until they're dead.
Maybe v2 will be like dnd where you get a move action and an attack action, to even the odds against the onslaught? Take two move actions, even, or a move and a shoot in any order, or...or shoot twice for one powerful shot?
Oh, and some enemies linger at the end of a wave. Free points.