Asides from tuning the edge pan velocity, the only thing I did today was scaling down the resolution. The manually drawn grid cells create all sorts of artifacts now, but I'm sure that, as soon as I switch to sprite tiles, everything will look alright.
Tip of the day: you wanna save yourself some headaches? Remember to set imageSmoothingEnabled to false every time you resize the canvas!
That's all for today. Next up: play/pause state; basic tiling.