Wow! Wonderful game. Everything was very well done - the art, the writing, the dialog, the voice acting. Both characters were immediately likable, and they made a great duo. Overall, this was a very high-quality play experience. I loved how the story progressed between each "level" of the game. I always love when games involve a good story. It kept it interesting and engaging. The story surprised me by how deep it got.
I only have a few constructive comments. The fighting music didn't really seem to fit the mood or artistic vibe of the game. I liked the sad, ending music.
The only other comment I have is that there were quite a few controls to navigate all at once. Fighting in the air was interesting. It worked though, since I didn't fall while fighting. But I didn't understand the need for 2 attack buttons. I just used K the whole time. I had no problem getting to the end of the game, so perhaps it was on the easy side, but I personally like combat that is simple and a bit "easier."
Overall though, very well done game! This one's a gem.