Start on any of the first three planets: Vulcanus, Gleba, or Fulgora. Choose your planet in the startup mod settings before starting a new game. Compatible with many modded planets!
Mods introducing new content into the game.
New places to build more factories.
Map generation and terrain modification.
2.1 added 2 new rocks to Vulcanus, "big/huge hot volcanic rock" and they're not being affected by the rock resource multiplier in the mod options.
Good catch, thanks for the report. Fixed in 1.2.6