So if you don't have a space player you can't win, but wouldn't it be fun to mess around on your lands?

It would definitely be fun to mess around on your Lands! And with the Alchemy System and arguably your best friends around, you can potentially just live a happy life messing around and experimenting with Alchemy and God Tier powers. You can also do Ectobiology Shenanigans around. But still, no Universe to rule, and potential constant Threats with Underlings and other stuff.