Got here from Mastodon as well! I think my biggest issue was that I wasn’t sure what I was optimising for, and what the goal was. I also got stuck when I got the third planet. I think I had used up all the supply lines before I got to it, so everyone there died due to lack of water (which explains why I never got put in charge of an actual space program).
I think having a quick guide on how to optimise the delivery loops would be nice. I got the idea it’s a bit like Factorio-style games where the order/timing of delivery matters, but the third planet seems to be where that becomes more important since the orbit is huge.
I will give it another go when I have more time and see if I can get further now that I’ve failed!