Nice idea : I love the fact that the game "naturally" becomes harder as you advance !
Maybe one constructive criticism : I would love to be able to continously press the left mouse button to shoot instead of constantly clicking, and maybe if that becomes to easy, you could add an "overshoot" probability. Maybe one other criticism is that the hitbox for the star is a tiny bit too large I'd say, but not too frustrating :)
Overall nice entry !! Congrats.