You can use the pen option to draw and erase option to erase. also for the rainbow try putting up the transparency ;D It's not very good because I released this in a rush just to became a Scratcher and it's not exactly my best version. Transparency let you change the how transparent the drawing is, the higher it is the more transparent it is. ?? There's a weird glitch after I picked a color and started drawing, it turned into a deeper shade of that color... 12/27/21
Code and art all by me. I want to save art but I'm not sure how to do it... I had fun making this! I'm so surprised that I didn't give up half way through (as I did for most of my project...). 12/27/21 --- I added a thumbnail(I drew it in my project) and fixed some tiny glitches