Did you ever play “From Dust?” You can pick up lava and water and sand and move it around like a God. You can shape the landscape for water and lava flows.
I thought a spin off game where you were a monitor like 343 Guilty Spark taking care of a Halo or a shield world. Then you can shape the landscape or even drop Forerunner structures to try and control the Flood or Covenant in your habitat.
Fun right?