I got the hang of it and scored 695 points during my last try, was missing an auto-fire more and more ;)
The game feels good and is addictive, I like the big enemy explosion effects. It's fun that the shrink effect makes you very fast, I like that it's not that easy to rely on it to gather the health items around the place, it's hilarious when you can't manage to get even one.
Thanks for sharing!