IMO this is the best sequel level out there and that's mostly because not only is this a great level by itself but this is just straight up what Zodiac should've been which is something nearly every sequel out there fails to do. It's to the point where I genuinely don't really care that Xander or whoever doesn't consider this a sequel because it would genuinely be a waste not to be considered one.

Spectre has more or less keeps Zodiacs theme and style and has very similar progression to Zodiac (they literally had to change the song to achieve this) and on top of that even brought over some of the old creators from it (e.g. Osiris, Yakob and Enlex). There's even a ton of references to zodiac such as the segment near the middle that heavily resembles Juhous part or Iris' part having the curved bridgelike structures that Dudex' part had or even Mercury/Mooshs part having very similar structures as Pennutohs part. From this alone it's very clear that the hosts and decorators care enough about Zodiac to have had these details included and this alone already makes It a great sequel in my eyes.

What elevates it to being one of the best however is the way in which it surpasses Zodiac which is that Zodiac didn't have enough variation between parts for any of them to stand out which is a problem that Spectre has figured out, It really feels like every part pushed its boundaries just enough for the styles to really flourish but without ditching the theme completely and as a result every part is distinct enough to keep the level interesting from start to finish while keeping the same theme which made Zodiac really boring in my opinion.

Just as some finishing notes Spectre is also just a insanely high quality megacollab, the majority of parts here would easily be the best part in many other megacollab levels but it does it in a way where each part is also so full of personality. It's genuinely impressive how this has one of the better Culuc and GrenadeofTacos parts and they don't immediately stomp every other part in the level.

There is also unfortunately one thing where Zodiac surpasses Spectre and that's just the fact that Spectre doesn't have iconic parts the same way Zodiac does with TMN and Shocksidian but really that's it.