I keep running into a bug where I've finished the ocean, core and atmosphere but the magnetosphere (I assume, the red one with the magnets) just stops progressing even if I have every slot filled and several upgraded. I tried refreshing the page and that just restarted the game wherein I ran into the same problem.

thank you for letting me know! I will try to fix it... what browser are you using?

I haven't been able to reproduce it but I put in some hardening code to hoooopefully prevent the issue. Thanks again for reporting!