Alright, I've picked it up. I'm trying to think of what to draw as my character. I've thought of bicycle, a bunch of cats, The Pac-man gang (Mr., Mrs., and the ghosts). I've thought about drawing anything that's supposed to be alive as something inorganic, and anything that's a machine, like that rocket ship as things alive. There's just too much to choose from!
Edit: I went with an Ice Climbers totem. Popo on top with a hammer, Nana carrying him on the bottom. She splits into two because she's basically the Hero's legs, but it still looks kind of cool.
At first, everything I drew featured 8-bit video game things. Clouds were Pac-Man mazes, storm clouds were ghosts after a power pellet was eaten, that vine Vudu showed was a Piranha plant with fire flowers as leaves. Ice in the water was metroids. Things like that. Then, it just became tiresome to draw this stuff every time a new type of platform was introduced. Now, everything is just a scribble or a solid, single-color block.
The game would be very difficult if you chose not to fill in things at all, or just filled one pixel or something. I thought about doing that one, but it would be nearly impossible.