Press [SPACE] to tell the bubble to go to your mouse cursor. Hold it instead to make the bubble chase your mouse cursor.
It's an overcomplicated breathing bubble that has a cool effect when moving around. Graphics are 100% pen, besides the background. It is also a test of controlling time using variables. Interpolation exists, but the method is probably a bad way of doing so. I intended to make a slider system so you could putz around with the variables of the circle, but I wasn't willing to take the challenge.
