Is does art! Use the sliders on the bottom right to change color and tool size. Use the buttons at the top to draw, erase, and undo. You can also press 'Z' to undo. Press 'L' to toggle lag mode on and off.
Who needs MSPaint when you can use SCPaint? This is an art-ing program I made to run as a pen rendered engine, meaning I can add fancy stuff like an undo button and large amounts of lag. Since lag is a thing for this project, don't expect to be able to draw beautiful works of art. Also, undoing is a more lag-free way to remove stuff than erasing, for the poor souls with really wimpy computers. I might try to add zoom or other fancy stuff someday. Mebe layers too. Ya like meh splash screen? ^.^