I have seen plenty of posts that those that loves spider sex with Leah which naturally both devs and some others have tirelessly said no because of too many that doesn't enjoy that kind of sex theme, but I have not seen any that makes some attempts of requesting a modded version of Insect Prison REMAKE that have spiders in it of course this modded version of the game needs to be marked that it has spiders in it so that those that don't like spiders can avoid downloading this modded version, but otherwise I could understand making that kind of request instead of crying for spiders in the original version of Insect Prison REMAKE.
I can think of the top of my head about making an alternate version of Insect prison REMAKE where some spiders was on the ship with Leah that landed on the island with her and somewhat mutated and grown bigger there without her knowing about it or something like that.
Another alternate version is that Leah on her way to the Insect prison island by the boat was hit by a storm that brought her to a different island with spider colonies.
My last idea is that Leah returned to live on the island with Rumia after she fulfilled her mission and spiders somehow got on the return ship to the island and from there the native creatures got threatened by the spider who mutated and growed to similar size as the native creatures so Leah together with Rumia had to defeat the spiders before they overhelm the native creatures on the island all the while helping the native creatures to restore the colonies on the island or something.