Click colors on the palette with your paintbrush to switch colors, and press any key to change backdrops (or see inside and switch them on mobile) - I highly recommend the white one. If you want to change brush size, click the cup with the brushes in it. After the brushes have moved, click whichever one you would like to change the pen thickness to (biggest meaning thickest). don't mind the tiny brush :/
ˏˋ°•*⁀➷ art by @merlincoder704 ˏˋ°•*⁀➷ a lot of this art (including the paintbrush) is from my watercolor cat project - make sure to check that out too! ˏˋ°•*⁀➷ comment if you have any suggestions or ideas to fix some of the bugs! UPDATE LOG: 6/6/26: shared "Pen Tool Experiment (WIP)" 6/7/26: made the paintbrush click more accurately and added more brush sizes that don't quite work just yet, also added effects that don't work yet eitherd things i'm still working on: 1) making sure your brush only switches colors if you touch the colors on the palette and not your drawing (you'll see what i mean when you play) 2) adding more settings, like an eraser