Spawn the particles around the edge of the screen
Added the drawing bubbles to the screen.
Remove pulsing, push more stuff into drawing.js

The background was starting to annoy me. Lunch time... yay!
Scoping global function... oops.
Spawn the entities from outside the map.

Back after lunch, I'm bad at maths, got cos and
sin confused for x and y but I did remember to
use atan2 this time instead of trying to work
out the geometry myself.
Added player and basic collision detection
de-globalize variables
Lots of small tweaks, fixed collisions