Fun game! I'm not sure how, but I clipped into a building and was beaten to death...
(playing on controller in the browser)
don't have much to add that other's haven't said...
- everything makes sense
- controls feel good (when I don't try to do a loop-dee-loop
- swooping feels like maybe I should go faster
- pumping the flap button while not turning seems the most effective for gaining speed, though it feels mainly forward and not upward at all (which would make a bit more sense and be nice for tighter turns)
- occasionally the music hitches if I change tabs, then fixes itself after a while
Good luck with the rest of it!