I guess I'm back. I liked doing weird gross-looking engines on this account, so here I am with another one after how many years. Press the space bar to start a stroke, the s key to end it, and use the sliders to change the size and color. Also the sliders don't like you so before you do a stroke after using one of them you need to click on the screen or it just won't work, I'm not sure why.
You can use this if you want but I'm sure there are better versions elsewhere. I actually remember how things work. That's fun ig.