The story of Swamp Worlds:

When the frost planets was moved from their place, some of them melted, the first half has become dirty, the second half moved close to the Grass Worlds, and by the warm of the sun, the life was spread very quickly. As there was many snow, there are big oceans with many water, and those was ideal for the plants. The planets are just about halfway on their new way around the sun, but they become a huge swamp.

Swamp Worlds (version 2.1):

Populous Reincarnated Mappack:
Latest version is: 2.0

Devil Worlds Launcher:
Latest version is: N/A