After clicking the green flag make sure to press Z to start drawing. E to erase the whole canvas R to replay the whole drawing H to hide your drawing (to show it you can press R) Change the pen color slider to change the pen color when you replay with colors other than red, the start of each line has a chance to start with red. You can get rid of this by replaying a second time. Hoping to fix this bug soon! You can't go back one step but I hope I can add that feature soon!
All done by me I hope you enjoy! :) v1.0 released v1.1 removed a bit of lag by changing the negative code, removed Z and X buttons for drawing modes