Drag your pen to draw. Press the space bar to clear all artwork but keep the current pen size. Press the up arrow to increase pen size, and click the down arrow to reset pen size. Feel free to remix and comment on what can be improved. Thank you!
Special thanks to @hikenviken, who's project "How to Make a Drawing Game" showed me how to make the pen work. And thanks to all of you, who play my game and tell me what's wrong with it.
