Ideas

Game takes place in space
No gravity
Floating objects
Player needs to reach target
Gaps between objects increase over time
Player has a harpoon like device to cast rope to objects
When shooting rope the player will move to the target object
Rope has a range
Range of rope can be extended with collectable items
Maybe the objects are all cubes?
Player orientation could depend on the plane they are standing on
Turrets with range bubble

Things to implement

objects that will move around
player
- harpoone thing
collectables