You can post your ideas for future worlds here.
I hope Ironhide adds:
-A Volcanic planet covered with Lava and ruin where fowl creatures lie in caves and pits of Obsidian or Volcanic Rock. Some lava will erupt from time to time so it can block your troop's path like meteorites in a way. Flame-walkers and other Mechas will have some resilience to the lava.
-An Ice planet completely frozen over and ice animals and species live here. The weather and freezing wind will sometimes freeze or deal damage to towers and bases unprotected by Shields. Flame-walkers can thaw out troops, unfreeze caves protected by thick layers of ice faster than any other unit, and can thaw towers or heat up nearby allies and/or towers maybe even the hero too.
-A planet completely filled with water and little or barely any land. Some Levels will be on land but hopefully mostly underwater in a city, cave, or the Units have underwater gear. Water will fill up some levels so the levels will have a time limit.
-A planet overgrown by plants and some scientist send there have been under the control of these plants as well as the ecosystem. All of these creatures are under the control of *THE BOSS OF THIS WORLD*.
-A planet where an enemy organization is bitter rivals of the Iron Marines. Enemy Troops here will be human and other alien species. This place will be a secluded planet which could be a desert but the idea is this world is some planet that looks abandoned but is not. It also will be a place where most if not all of the planet's inhabitants/natives went extinct a long time ago.
-An Endless Planet. Where Time keeps looping and bringing back foes from every planet as well as Bosses. This planet is a training ground for most Iron Marines but kept off limits to civilians.
-I have more ideas but just have a mostly general idea of these. Anyways post your comments about what you think you want a new world in Iron Marines to be. Thx for reading.