Hoo boy. Disappointed is the word that comes to mind first. The rules set on this machine was not well-developed -- as witnessed by the attribution of the design to a pseudonym, it was a strange committee -- and one of the original "pinball people" prominently on the Spooky payroll completely disassociated himself with the game. The PF layout had some serious promise to it, with the three-level ascending mini playfields and the hidden shots on the right side, but it really could have used a bumper (maybe under that hidden zone) and the shot rebounds were not well tested at all. There's a lot of dead bounces and back and forth right up the middle, and as such the game sort of plays like all the shots are in a trough.
I can make no comment on theme integration for "Halloween" but I was an Ultraman fan and I really like the whole Kaiju-battle/Science Patrol theme, plus the vintage shots. So I won't be a hater on that count. But I did find the sequence for the animations and "story line" a bit odd -- there's no real rhythm to it and there's a lot of repetition of the same screens. There's other bits here that show a lack of polish from the design team; things like awkward fonts and text layout.
None of the machines I've played have had more recent code releases on them, but Spooky's willingness to release machines with only half the software developed is another nit that is becoming a whole nest of lice in my pinball hair. It's a bad trend and they don't have a big enough staff or harness to get away with it. With the Scott Danesi machines, they benefited from, well, Scott Danesi. Ultraman just felt like "oh hell, that's good enough, we're only making 500 of them."
I had one friend who got an early shipping collector's edition, a really big Ultraman fan, and he was so down on the machine I canceled my own order (and after I'd played at public shows and just been left cold after being really excited after Rick and Morty) -- and could not find a buyer, even at a discount, for my deposit, nor would Spooky make good. Spooky is thus pretty much dead to me forever more. That was a bad move, Spooky, on your part, for building long term customer mojo. I might have looked past this release as an aberration but now I'm remembering all the issues with other releases that have overshadowed successes like Total Nuclear Annihilation and Rick and Morty.