This is surprisingly cool and satisfying! A few issues: 1) On Mac, you have to copy the colors.txt file to the MAC_OSX folder for them to work. 2) I'm having a lot of trouble switching colors, curling my left thumb in doesn't work most of the time (making a fist sometimes does). 3) There's not much feedback on which line shape is chosen, maybe change the shape in the palm? But regardless, nice work!!