Flat Planet Start Page
In TerraGenesis, when you buy the Flat Planet mode for $7.99, turn it on, and then go to the menu, instead of an unterraformed Mars and terraformed Mars, you will see a flat terraformed Mars, which spins around to show the unterraformed side.
Ice Launcher Desciption Alludes to Different Game
The description of Ice launcher: "CEO Nwabudike Morgan described this incredibly ambitious project."
In a different game, Alpha Centauri, there is also a Nwabudike Morgan who is CEO of Morgan Industries.
Daughters of Gaia faction alludes to faction in different game
Daughters of Gaia faction is very similar to Stepdaughters of Gaia Faction from Alpha centauri game. Their policies (both want to protect planet from harm)and their banners and even their names are similar.
you can find all info about this organisation. So I think Daughters of Gaia faction are mostly created according to the Stepdaughters of Gaia faction in Alpha centauri.
Horizon corporation faction alludes to faction in different game
Horizon corporation is very similar to Morgan industries faction from Alpha centauri. Both think that money are unstoppable and both are not good with population and even their banners are similar. So Horizon corporation is creating according to Morgan industries faction from Alpha centauri game.
All information about Morgan industries is here: https://alphacentauri.gamepedia.com/Morgan_Industries
Pontus and 4546b
The planet of Pontus bears a striking resemblance to the planet 4546b from video game Subnautica. While the maps do bear an extreme resemblance, the beginning stats of Pontus are not aligned with that of 4546b.