I only got 7, but my tactic was just to avoid even trying to get things, haha. I feel it needs a little bit more of a steady ramp up in difficulty; like start with just platforming, then introduce the bugs, then the flyers, etc. At the moment right out the gate it's all there.
But it is VERY good for your second game ever made, to be honest. Really good consistent graphics, solid feeling platforming, good sfx, although no music?
Good work!