Somewhat low difficulty curve D;
I liked it, but it was way too easy.
I was around 200k exp and stuck at under 10 fps because of the amount of bullets on the screen, so I stopped. :<
Sorry to say this, but if I wanted to play Crimsonland, I'd play Crimsonland. Still, I like your take on the Ion Orb thing, and it was decent for a flash game.