Fun little shooter with a TON of different toggles(/content)! The major feedback I have is that the font is a bit hard to read and the instructions tab has too much to read - I skimmed over it, and decided to hop into the game instead - I don't want to be stuck reading for a couple minutes! I'd rather be getting a pointed summary of your mechanics rather than a story trying to hype me up - I'm already in your game, after all, I want to know what to do, not how it's going to feel or how exciting it's going to be.
I would've liked an option to turn off the screen shake, it was too intense for me to play comfortably.
That being said, the graphics are quite elegant and the gameplay flows very well, it gets quite hectic later on! Well done.