Hot damn I love the sounds of those ships buzzing by! My main issue was that I could never tell what height the ships were going to attack from, they seemed to follow a winding path, which made it hard to know whether you were safe or not. Perhaps they could always attack at the same height, or maybe show some sort of indicator of their approaching flight path? Another thing that got me was the double jump, I didn't realise I had it until I arrived at a point that required it. That's not a big deal tho, I figured it out reasonably quick. Overall the game was pretty neat, it controlled well, and I'm a big fan of the way you've made the sounds feel alive and 3D!