I wouldn't worry too much about the screen cuts for Halloween or the music. There is a ton of content that can be integrated. I am sure Spooky is dealing with a lot of "opinions" on exactly what should be used where and how many times.
As stated previously Tsubaraya was totally on board with handing the Ultraman reins to Spooky. They've probably been waiting for this for a long time.
The owners of Halloween IP don't want a failure anymore than the rest of us. After the stream I would've probably grabbed one of these if I had not already ordered an Ultraman and had enough clams to do so.
This game is in beta and will be a glorious addition to the Spooky line IMHO, once the red tape is cut through.