I really love the flowing movement.
This is going to sound strange - but I think you can remove the left mouse button.
It felt so much more satisfying, and looked so much prettier, when I was snaking around the sky like some sort of celestial serpent (although, this made the levels harder).
I also love how such a simple idea can make things so complicated in non-obvious ways.
:)
One thing that I would suggest changing is the hitbox for the big wide laser beam.
On level 10, I died instantly, even though I was at the top of the screen, the ship was at the bottom, and (visually) the beam hadn't hit me yet - I should have had *just* enough time to escape.
I suspect that when the beam activates, you just turn on a collision rectangle that covers the whole area it will cover?