I like the tool selection mechanism. One minor suggestion there: allow me to make more quick, "jerky" gestures to select a tool by not limiting the size of the

I like the tool selection mechanism. One minor suggestion there: allow me to make more quick, "jerky" gestures to select a tool by not limiting the size of the circle when I click/release really fast. So I should just be able to right click and flick to the right to get the rectangle tool. It's a tiny detail, but one that might be fun to implement :)