Terra Palus by Lukah, updated for Factorio 2.1: a hybrid swamp moon of Gleba with both biters and pentapods. Mine Palusium ore and use UV light to freeze those that would see you destroyed.
Uranium doesn't spawn on Terra Palus by default. Turn on the startup setting "Uranium ore on Terra Palus" (Settings → Mod settings → Startup).
I've made some changes, so since 0.5.0 this works in an existing save too: uranium will appear in new areas and in the explored ones without buildings.
