The art style is very unique and everything looks like it came out of a comic-ish story book, I love it! I did not go very far without a controller, but I like the alien/mystery atmosphere of the game. (there's probably a way to aim with keyboard that I haven't figured out T^T)
The opening scene is amazing. The separation of layers of the sea give it a paper theater style effect (I have no idea what it's called), so I kinda wish the game continue with more of this layer-effect artistic style.
Lastly, I think it would be nice if the camera can see a bit further.
Other than that, I think this is a very beautiful game!