Press SPACE or click to place slime, left or right arrow keys to change colour, up or down arrow keys to change colour brightness.
This is a "remix" of one of my old Scratch 2 Offline Editor projects. I changed it a TON. It may sometimes lag a lot due to clones, even though I changed this to also make parts of the slime that already duplicated become a stamp. I didn't put much work into this.
