I put considerable time on the game a couple weeks ago at the Ohio show. At that point it was running prototype software (game would reboot with a tilt). My quick takeaways:
Art - Evaluating the playfield art from pictures it looks incredibly busy without much cohesion. In person the art just worked for me. It's not great, but I had no issue with it either.
Music - I found the music to be fairly well integrated. In this game it worked.
Display - This was very hit or miss. The main screen animation is helpful in presenting all the status info you need in one screen (very similar in style to the main screen of WONKA). The mode screens were good as well. The one thing I couldn't stand was the cut to the fuzzy video of an Oktoberfest celebration from far away. It just doesn't fit with any of the other animations at all.
Rules - My initial impression of the rules was extremely favorable. I found the tent modes well thought-out and extremely varied. I also liked the steins and their rules. The one-handed mode was more difficult than I expected it to be, but I really enjoyed it.
Layout - This is where the game for me just shines. I just LOVED shooting the game. I could hit all the shots and the shots felt rewarding, the layout was varied, the magnets are integrated very well. I love unique, non-fan style layouts and this one was a huge winner for me in this regard.
Takeaway - This is the first new game I have played in several years where I simply had fun and for me, fun is what pinball is all about.