Click the green flag to generate a level. The "goal" is to get to the right (there is no end / next level, use the green flag to generate another one). This was more of an experiment, so not much can be expected from it. Not all levels are possible.
The goodness of a platformer is not quality-of-level times quantity-of-levels, as there are platformers better than this one with a lower score. (And ones with a higher score, like my infinitely scrolling platformer level editor.)