Your aim is to avoid randomly moving asteroids. You can't shoot them.
There are 3 modes: Story, Survival, Relax.
In story mode level length is from 30 seconds to 2 minutes. Every next level is harder.
In Survival new asteroid is spawned every 15 second.
It's an open source project started by Dmitriy Sorokin. The game uses SO Engine (ShadowEngine).
Project on GitHub: https://github.com/dimsa/ShadowEngine