Scribble is - quite literally - what I scribbled in my notebook in a lame German lesson in September. I then decided to make this into an actual game, keeping the very style I used in said notebook (mainly due to my inability to draw properly).
The level selection screen. Levels are unlocked once every level in the adjacent lower difficulty level is finished, with the exception for Tutorial and Easy, which are always unlocked, and the insanely hard bonus level that unlocks after finishing every other level without losing a life or missing to pick up any extra lives.