Very nice art. And very serious. At first I was sort of getting an Ecco the Dolphin vibe, but maybe that was just my brain seeing what it wanted to see. Once you got to flying through the air the game took on a more arcade-y feel that really worked.
At times the controls felt a bit weird, and it took me a minute to really understand how to actually gain enough momentum to spin at all. But like I said, once I got it the game really took off.
Ecco the Dolphin or not, I like it! Great work!