Charming. Polished.
The game is well conceived and well executed: A cute concept, a core mechanic just quirky enough to stand out while being intuitive and usable. It works. It all really works.
Only one thing I would have changed, if it were in my power - the sparse scenery isn't such a big deal when we're focusing on the enemy, but it would really make the ending better. Just letting us fly free over open fields after the boss actually is a kind of cool idea, but it would be more rewarding if you gave us some scenery to explore. Let us see the world at peace again and fly away home, yeah?