Hi, I would say the challenge is currently below what you have on vanilla planets, and can be tackled from any point when in space. Some techs are locked behind the electromagnetic plant, and it's easier to produce stuff once you have the foundry. I would like to add some tech branches that would require elements from gleba and aquilo too, where thematically relevant and balanced.
I plan to add further content to flesh out the challenge and erase any redundancy or tedious parts, and to make the lore a bit more exciting, potentially! This is a starting point. I also want to make sure the rewards are on par with current planets.