Your planet is so small it has a problem: no atmosphere. This cause asteroids to fall directly into your planet. And you don't like it...

Crush is a tower defense where you defend your planet from those asteroids. You can move around the planet using a and d keys and shoot falling asteroids with your mouse.

Fortunately, asteroids give you resources to help you build up your defenses. Sadly though, a meteor shower is coming and things are going to get rough.

It's crush, or be crushed.