Fixes some minor issues
When Nano Assault Neo came out on the Wii U eShop at launch, people noticed a few issues that detracted from the experience a bit -- namely, GamePad disconnection problems.
It looks like developer Shin'en Multimedia has pushed an update that fixes these issues as of yesterday, so boot up your game and give it a try if you gave up due to the bugs.
The developer also notes that the update auto-downloads, but there may be a delay in the US -- so if it's not available now, try again later.
Shin'en Multimedia [Twitter]