I'd especially like to get feedback on some drawing magic: when you draw inside some area – you won't go out of borders.

Promo codes (request more in comments if these doesn't work):

EYK33NM7MNFR MAFXJR7EAN7F 7FAHEXERM9F7 MN7N7WLR3RJ6 7E36KF3MFTX7