Click a picture to colour, and then change features like coluor and pen thickness in pen settings. Set the pen to rainbow mode by clicking the button, and clear the screen with the clear button. Press space to hide the buttons, giving you more space to colour, or screenshot your masterpieces!
This was a project that I started making a few years ago when I was not very good at coding, which I picked up again in my IMMENSE boredom. Have fun!