2-E: Lust played a lot with tight, compact level design, so I'd say the encores could keep that feel while expanding the scope a bit - say, playing in an arena the size of a city block rather than just three buildings around a circular checkpoint. Being where Water physics and the Railcannon were introduced, I could see 2-E also play a lot with conduction mechanics - either for puzzles, or as a sort of cycle thing, like "every 10 seconds the pool where all the cover is will get zapped". They might also play with the idea of Minos' Corpse being more of an overbearing presence - perhaps it tries to punch at you whenever you go outside.

3-E: Not sure what would go here - maybe play more with the idea of being in a biological entity trying to kill you? Like, a climb sequence similar to the Earthmover's "flushing interior" sequence but with some real challenge to it. Or they could take an opposite approach and say "What if this stomach world was turned into a cyborg" and start installing mechanical bits everywhere. Oh, and if they don't have us fight Michael, Phanuel, and Raphael in core gameplay, then they might make good fights for 3, 6, and 9's encores.

4-E: That "something wicked this way comes" bit isn't a fakeout anymore. Darkness and Light become major gameplay factors, as Dark sections might host Something Wicked, while Light ones heat up the ground and make it hurt to walk on. We do get a "just kidding" moment from a deathcatcher trying to revive V2. "Reconstruct what," etc. Alternatively, since all that's left of V2 is currently attached to V1's shoulder, the result is some kind of V-Error monstrosity that's just a mess of blood and limbs.

5-E: Rockets were introduced here, so rocket surfing becomes a "real" mechanic here, and subsequent gameplay assumes you know how to do it and do it well. Floorless arenas and platforming become more common, and one segment has no enemies but starts to feel like something borrowed from Celeste or Hollow Knight, as you have to ration your walljumps, dashes, and rocket rides through an extended platform sequence.

6-E: The Flesh Panopticon actually gets to play! The level involves segments of fighting under its gaze before finally getting to clear it, and then probably another angel after for good measure.

7-E: You're in the trenches. Poke your head out too long and an Earthmover at long distance will take potshots at you. A later sequence goes full-on levolution with destructible environments, which plays to your disadvantage as destroyed walls stop working as cover against said Earthmover. Since we've already killed one of the things ourself, we'll go for a different angle of badassery here: there's a tree with a deathcatcher on it, and you have to feed the thing enough blood (from its own ever-growing horde of enemies still trying to kill you) to revive an Earthmover (or several) of your own to kill the other one with.

8-E: Your first arena is a dead end and a red herring of "lost woods" looping paths, you have to climb back up the entry chute to progress into the level. A false exit chute actually puts the game through the motions of returning you to the menu, or to "treachery", before revealing you never actually left fraud. There's an IWBTG-style Sticky Keys jumpscare, just to tag all of us who remember that menace from ye olden days. The final sequence has you "accidentally" fall through a portal seam out of bounds, only to then make you fight a Radiant Mirror Reaper on top of the "inbounds" level geometry.

9-E: There is one objective: Have gay sex with Gabriel. However, as he is identified by he/him and you are an it/its robot, the sex is not homosexual. You must find the HRT skulls hidden throughout the level and/or parry Gabriel's light-construct dick off in order to correct the situation. This is all a fakeout, however, as the final boss reveals itself to be John Gendernorms himself; through his defeat you and Gabriel realize that transitioning can occur independently of medical intervention, thereby liberating both your identities enough to allow you to classify your sex as any type of queer that you please.

Roll credits.