It's an incredible value for 2 bucks
There's a level up system in place, and it's crucial in order to progress to harder stages, so shooting and collecting the gems it's essential in order to go further. It's a fun and interesting formula, since it forces you to replay level, grind some wealth and upgrade your ship. The levels and enemies are pretty generic and they will be repeating a lot, and this is a few of my problems with this game, every level feels just like the one before, with a different pre-set of enemy patterns. And stage bosses can be a pain in the behind to defeat if you don't manage your ship properly.
In essence, this game has a cheese and silly story with pretentious humor and it's pretty juvenile and the game doesn't really need a story to start. But you can tell that the developers gave this title some love, it is fun and will keep shooter fans entertained for a while, that's all you should expect from this game, and it delivers.