Reddit users are reporting many problems in the Wii U version of Mighty No. 9, including glitches, frame rate drops, long load times and even the Wii U bricking completely. A lot of the issues seem to be present in the Wii U version, although there are a few Steam version problems being reported.
Deep Silver has released a statement saying that “we’re aware of some isolated incidents of consumers experiencing issues on Wii U, and they’re actually being addressed in a patch that’s deploying out on Wii U systems today. The patch is already live in Europe, and should be hitting U.S. before the end of the day”.
Update: Here’s a video of the game in action running on the Wii U