Orbit
Mechanical satellites defend a planetary core against objects and machines approaching through space.

About
Enemies enter from the edge of the arena and move toward the center. Defenders occupy the ring around the core, so placement determines which paths and waves they can cover.
During a level, resources are spent on new defenders and upgrades. Four recurring defender roles handle direct damage, groups, control, and longer-range threats in different ways.
Each world contains eight levels. The fourth is a miniboss encounter and the eighth ends with a boss. Completing a campaign also opens its endless format.
Tap a ring slot to place a defender, tap a defender to upgrade it. Pause with P or Escape.
What is in it
Mechanical satellites defend a planetary core against objects and machines approaching through space.
Living defenders protect the center of a colony while hostile creatures push in from its surroundings.
The arena moves inside a biological system, with cellular defenders holding the membrane against infection.
Completing a campaign opens an endless run of the same arena, scaling until the core falls.