It's a road you'd want to take with a friend. Or three.
It's a side-scrolling shooter, where the screen moves to the left, and you shoot everything to the right. Simple.
It's a simple game, with a simple story, with simple gameplay, with outstandingly simple results.
People flee Earth.
People steal Araxian (I may be wrong) technology.
You test their new invention.
You blow all Araxians to hell.
So, you've got five ships, each can take around 5 normal bullets before dieing on contact with anything. Then you have two laser cannons. That's all your weaponry.
But then there's the super weapons, like a laser that pretty much kills anything directly ahead of you, and the missiles which swarm around on the screen. And of course you need shields, which reflect normal bullets (It's fun to get close to a boss and watch it kill itself if possible), and some weird thing that drains the power out of everything around you. So, if you're surrounded by the cheapest, purple-est enemy in the game, just hit B and they'll all be floating pieces of scrap to blow up.
But that's just boring, altogether.
That's when you need a friend. The game is much easier, and when you are, you can merge ships so one is acting as a turret while the other gets upgraded super weapons.
You could merge four friends together to make some Epic Formation or something, which I believe that if the bubble shield and power drain is bigger, you launch more missiles, and the laser is massive. It's very satisfying to be in this massive ship and decimate half the screen.
But then, all the enemies are the same, throughout the entire game.
You have blue ships, red ships, leech-things, mines, laser-firing purple things of death, yellow things which fire in all directions, and three way-green ships. That's all the enemies you'll see in the game, save for the bosses, which all look somewhat alike.
The backgrounds are pretty generic, although they aren't boring, though. You'll see debris floating in the second stage, the insides of an Araxian ships , and war-torn buildings in Europa or something.
Audio isn't good or bad. It's just there. I guess, though, that you mute it and listen to a randomly chosen Star Wars track or something, you'd get a better effect, but I'm just saying that the audio could be better.
All in all, it's a fair game. You might get confused over whose ship is whose, but there doesn't seem to be any problems otherwise. Get this game. It's free, and you can get some achievements out of it, too.