I enjoyed this game a lot. I really enjoy games like this, and this one had a really nice style.
One thing the game definitely needs is some frame of reference for your own movement. All you have is a parallax background layer and other objects whose trajectory you also can't be sure of. If the movement were more Newtonian, the relative frame of reference would be less of a hindrance.
Also, maybe some arrows pointing in the direction of other objects. I kept dying because I would lose all of the objects, or I just wouldn't be able to find enough comets to eat. I never made it past eating the comets.