This is such a great game. Would it be possible to sandbox play after the time runs out? I've gotten four star runs with unexplored planetoids, and it's a tiny bit unsatisfying for my completist soul.
The PICO-8 version of the game is not getting any new development, sorry.
You can take a look at its bigger brother, which includes many new ways to play (including an endless mode for when you want to colonize *everything*): https://store.steampowered.com/app/1264280/Slipways/