Dodge, shoot and free the galaxy of the evil space mega corp. Use a variety of different weapons and spaceships, each with different playstyles to overcome many challenging levels.
After 100% the whole game, I can say that I've had fun with trying it out.
The trailer doesn't lie as what you see is what you'll get. It does shake it up with several new enemies with different attacks later, as well as boss fights at the end of each campaign. Weapon selection is entirely left up to the level that designs to give it to you or not....