Thanks for the useful feedback! Yeah, I probably went a bit overboard on the levels. I ended up making enough levels to tell the story, but I also found it a bit long.
I did have another concept I wanted to add where you rescue people stuck on the moon before destroying it. The goal would have been to avoid destroying the people blocks until they were on the outside of the moon so they could be rescued. But I ended up shelving it since the AI solver became too complex.