Abstractanoid

— Hi, Mark! Did you hear about these aliens? They are more durable than my grandpa's WWII tank!
— That's bad news to hear..! How can we fight them?
— Of course by bouncing asteroids off our spaceships from the Asteroid belt! What did you expect, laser beams?

Are you the one that could save the whole mankind? Let's figure it out!

— 40 levels of epic battles!
— Epic chiptune soundtrack!
— Retro-style graphics!

Source:

Steam Store Description