This is a simple puzzle game whereby you must remove all the available marbles from the game arena. To remove marbles, line up at least 3 of the same type. The marbles can be lined up vertical, horizontally, or diaganolly.
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)