I like the simplicity, but I feel like it is a bit too unforgiving.
The objective here is to protect the girls from the evil goblins that try to kidnap them, and you do that by hurling the goblins out of the playing field. This kind of straight-forward, unique concept is always interesting on its own right. Back in the early days of video games, when the industry still hadn't figured out a handful of formulas that work (and started repeating them to exhaustion) this kind of simple but unique game was way more common.
The execution of this concept is mostly pretty nice. I mean, it does get too absurdly hard after a certain point, where you can't possibly expect to react to the ridiculous amount of goblins coming from every direction. To make matters worse, the girls themselves seem to have no self-preservation instinct whatsoever and don't even try to escape when a goblin runs towards them.
Maybe something like a temporary powerup that allows us to destroy enemies faster, or some kind of upgrade system where we can teach the girls to run away would be nice. The way it is, it becomes way too chaotic too quickly, and it just stops being fun to play.
Also, a little nitpick: why is it possible to put goblins down instead of throwing them? It would be much better if everytime we release the grab button, the goblin got hurled. As it is, I accidentally put goblins down when I wanted to throw them far too many times, and there is no conceivable situation where gently putting down a goblin is advantageous.