Considering that the rules are very restricive, it would have made far more sense to have provided a template for the game. There will be so many redundant elements in every submission that I'm wondering how different each one will be. Aside from different kinds of movement abilities and enemies there seems not to be any way of being creative. Why restrict the way you can kill an enemy to only one? Even "simple" platformer games from almost 40 years ago allow for different ways to defeat enemies (Mario can stomp, throw fire balls etc.).