Xbox 360 title updates: install game updates without having to download them directly from the Xbox Live platform. Useful for people who do not have their Xbox connected to the Internet; games will be patched with bugfixes and allow the use of DLC.
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)