This is a GBA port of the popular internet game SlimeBall. The objective of the game is to score 11 points.The controls are:Left - Move leftRight - Move rightA - JumpStart - Pause
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)