NOTE: The game automatically saves the data in going from evelonth.save level, or change the configuration, and uses the fat, so you have to have a compatible cartridge or patch the rom. if you see an error at first, is for this reason. Controls
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)