A fresh modern american styled shmup with online co-op. Online Co-op! More shmups need to be on steam and they also need to have online co-op.
Very good upgrades and weapons customization. Your ship has slots in which you can stick weapons wherever you want. Look at the community hub for screenshots of the shop. You can place weapons on the wings to shoot sideways. You have "scrap" (money for shop), experience points for leveling up your rank (which opens more weapon slots), and perks.
The levels move slow and it may seem like a walk in the park towards the beginning, but don't let that fool you since you can find yourself easily overwhelmed all of a sudden. It's not a "bullet hell game" since there aren't 1000 bullets on the screen, but that doesn't mean you won't run into a bullet infested screen. This is definitely apparent in the later levels. The level of challenge is perfect with this one. It's not too easy and it's not too hard to make you stop playing altogether.
Besides it having campaign co-op, you can split-screen battle a friend to see who ends up with the higher score. There are a few power-ups specific that appear in this mode which will affect the other player. It can either be positive or negative so that you don't just grab every one you see.
You have one life to beat a level, but you have two lifebars. One of them recharges when you stop shooting and once the other one is depleted, you die. Very neat feature.
Bottom line: If you're into shumps, this one needs to be in your library.