Fuzzy Wuzzy Games revealed in the game’s official account its file size, taking 1.9 GB of space (more than 15, 000 blocks). This is a quite big download for a eShop game; most of it is just from the music of the game.
You can read the official announcement below:
You'll need a lot of available space to play me on your Wii U. You can #BlameYanni for the massive amounts of music = 1.9GB download
— ⒶⓡⓜⓘⓁⓁⓞ (@ArmilloGame) June 23, 2014