Pretty neat, for the most part. Solid little game at the core of this. I feel like the biggest issue I had was that the mechanics of the bouncing of the balls feels pretty random with which directions they roll in when they hit walls. If it was easier to predict where they'd go I think it'd be more fun to actually try hitting them rather than just avoiding them whenever possible. Also, I think the pacing is kind of awkward near the end after you've defeated the submarines, it's not clear where you need to go and it took me a lot of aimless wandering before arbitrarily ending up at the hermit.