Press Space to change between drawing and dropping balls. When in the drawing phase, press c to change colour. Your current colour is shown in the box in the top left corner. Grey is platform, Green is Goal/Delete the ball, Yellow is trampoline, White is eraser. TRAMPOLINE CAN CAUSE LAG IF BALLS GO TO FAST!!!! Fun side note, trampoline can cause ball to glitch through platforms.
Thanks to @Tumplebutt2 for trampoline idea.
