Another one of those random alien sightings.
There was a random alien sighting caught on tape.
The night has come. You and your alien friends came to earth and need to do some tests. Fly through each level collecting stars, avoiding bombs and abducting all the cows.
Evolve into a higher being, roam around the microscopic universe eating other organisms in your path.
Use your grappling hooks to climb the canyon.
Defend your base from huge hordes of alien critters. Bombard them with cannons, lasers, and more while upgrading your base so you can survive the onslaught.