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?

Really challenging game for me! Need to keep my cool with the controls, but it's enjoyable and quite fresh!

Really fun and satisfying gameplay! The movement felt fresh and challenging in a good way, and the level design kept things engaging throughout. Great job overall!