Beebeeroids is my second gaming project for 2012 and again, I apologise, but I haven't visited it for a while (probably two months) Please excuse the fact that the game has physically been shoe-horned into the page, when it was originally created it was meant to fit in a 640x480 canvas, which doesn't suit the content area of this site. I will have that fixed by the end of the day, along with an annoying warning where I know I've set a context fillStyle incorrectly.
If you want to play the game, click inside the canvas area (left mouse button) and then use the z, x, shift and enter keys on the keyboard to rotate, thrust and fire. There's no collision detection at the time of writing but I hope to have that in place within the next week.
There are actually three different asteroid sizes (only two shown) and the game should run on pretty much anything that supports canvas objects at 640x480, as the CPU usage is pretty minimal.
Got around to scaling the game down. Now the game can be rendered at any size canvas (I've tried it at 320x240) and everything scales down to suit, from the size of the objects to the handling of the player's craft. I've also got rid of the fill/stroke style bug.