My original idea was to have enemies mercilessly follow the player as you try to run to the end of the stage (the idea being trying to escape the void). Enemies would follow you for quite a while, so the longer you neglect them the harder it becomes as more of them are on your tail. Would work pretty nicely as a roguelike/lite, weaving in bosses and secrets in between.
Unfortunately, the code for this game is an absolute dumpster fire. I may return to the idea soon, but I already have plans for another game that I want to develop.
Thanks for playing!