Thank you! This is exactly what I'm looking for. I really appreciate it.
Regarding the deaths, I was thinking that it would be better to have a delay so that the resets occur just after a death, and in fact that's how I ran it when I playtested it, but this creates a problem where I need to have a content warning for child death, which i think would turn off a lot of people. I would remove children from the module, but the youngest being the only remaining conscious colonists is important for the explanation of the "illness," that it's caused by forming too many memories and that children have more space to form them.
I think my wording for Baba Yaga might be confusing. It just means that of the PCs and colonists that remain conscious, she goes after the youngest. Most likely that will be the 12-year-old, but you never know who people will play as.
I don't know if I've prevented the groundhog day scenario frustration, but I've tried to put in multiple ways to solve problems. For example to get into the lava tube, you can disable the power (it's a power-locked door), have the Bulgasari eat its way in, (it's metal), or convince Kwame to let you in. I was going to also give Jedda a key to the door, that she presumably got from the mayor, her dad, but didn't have room.
For getting up to the greenhouse, I did a worse job. You can use the fabrication machines to build something, which is what my players did. I also thought you may be able to have the Sluagh pick you up and drop you there, but they're going the wrong way. You couldn't just get the repair tech to fix it, since I described the cabling as snapped and coiled on the ground and they'd have to climb up to replace it. And because the polyhedron is in the greenhouse, you can't yet combine myths to have the rain cool the lava flow enough to climb it, say.
Anyway, thank you so much for taking the time! Lots to work on and tweak after the jam.