Huh, some people actually saw this. Fun! For the record, I've now beaten Inv's campaign for the second time and went back around to get screenshots of all the unique areas, so here's a part 2 with more tips and a catalogue of all the interesting Inv/Sofanthiel specific locations.
It appears that getting up the Wall/through the Underhang/up the Leg is almost nearly impossible, especially in the Wall's case, without devtools. Though I believe it's possible to get through to the karma five gate in the Underhang, the fact that it's karma five gives me pause. It's the last thing on my list to get through without devtools so I'll update if I figure out the most optimal way.
Since Inv has Gourmand's food consumption mechanic, it can seem incredibly challenging to get enough food. However, there is one substantial food source that doesn't undergo that penalty, since it's technically a viable food source for slugcats like Survivor and Monk: Centipedes. They give a lot of food pips, and this includes red centipedes. Target them instead of lizards if you can.
On another food requirement note, it only takes four regular-sized lizards to feed Inv fully. This is most helpful in Industrial, since the yellow lizards there spawn in packs and can be easily dispatched with a singularity bomb if caught in tight quarters.
Although hurricane lizards have almost zero territorial aggression towards each other, red lizards still have a constant fight-to-the-death drive towards each other, which is most useful in Chimney Canopy, where there's about... four or five in the same general area, right after the shelter by the Industrial gate. Eventually, only one will be left, and since it'd be quite injured it will leave to its shelter, leaving a full bar's worth of food on the ground. I like to lead them towards each other to initiate the conflict. Thus, there's no need to constantly eat Yeeks (which is time consuming, annoying, and finicky).
Wolf spiders and spitter spiders make quiet hissing noises when you enter a room, sort of in the same way that a white lizards camouflage flickers when you first enter a room. This comes in handy in Shaded Citadel, since it can let you know if one's close by.
If you want, you can turn on the setting called "visual threat pulse" in remix, since it shows you the level of danger you're in and is unconnected to the threat theme, which is useful in areas without threat themes like Shaded and the Wall.
Though the gravity in Chimney Canopy stops you from crouch-jumping, backflipping, and jumping in general, it doesn't stop you from doing a well-timed slide-jump (am I getting these names right?). Most importantly, if you want to get to the Wall, doing a slide jump with or without a Yeek at that last gap can get you over, though I'd recommend a Yeek if you want to get the popcorn plant.
Utilize the end-of-cycle if you can't progress because of creatures blocking the way. When the cycle timer gets down to two pips, all creatures will immediately abandon what they were doing and rush for shelter. Believe it or not, you can get pretty far in one minute, especially if you're already close to a shelter.
Lastly (as long as I don't update this), think of the campaign as less of a Rain World survival sim, and more of a frustrating puzzle. Most of the creatures you encounter will kill you easily, so stealth, an understanding of the movement mechanics, and patience is key.
That's all the tips for now, now onto my second win! It was actually more fun now that I'd already beaten the game once. I tried not to use passages, but getting out of Sky Islands is annoying, so I caved eventually.
This one took a bit longer because I was trying to go through without passages, but overall went smoothly. Most of the deaths were from Subterranean, before I realized that it's actually safer to go through filtration system as soon as you can than it is to go above ground. Red centipedes are annoyingly bloodthirsty, but they don't seem to travel into Filtration often.
Warning for spoilers on secret/out of the way Inv locations! I was trying to not be too spoiler-y in my post, so I'll keep a warning above these in case you'd rather find it for yourself.
Quality got fucked on this one, but this is Andrew's Basement, a subregion in Pipeyard accessed from a pipe at the bottom of the region. Fun little place, one of the few peaceful areas.
Because we can't have anything nice, Moon is unconscious, and her subregion is filled with fluctuating water levels and green electricity. It's pretty cool, actually.
And here's Pebbles, who I tried to get to without devtools, but eventually gave in when I realized the Wall route was impossible without them (I got halfway there too...). Anyway, apparently he kills you after a short speech, which I didn't hear because I left before he finished.
Lastly, here's the energy core at the top of Sky Islands. It powers the gravity shift that covers half of the region. Pretty cool, though it's rather clear that the core isn't as detailed as the one in Rivulet's campaign. Oh well. You do fun little spins with this one, so I guess that makes up for it.
That's all I've found! (Though mostly with help of the wiki, haha.) The only one that devtools were used for was Pebbles, because clearly the route to him is made even more annoying than... all the other routes. It was fun, though! I still want to see if I can get to him without cheats, but that's for another day.
(Btw, the pup you see in most of these screenshots is ID 815. Odd little guy. Keeps blowing up.)
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