Piggy is a sample tracker with an interface and controls specifically designed for a hand held game console. along the way there have been many bows to LSDj so if your comfortable with that gameboy tracker, piggy will fit like an old hat.
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)