This is a brilliant little arcade style game. Incidentaly I picked this up in a Humble Bundle, but already before I start this review I'd say that it is definitly worth full price!
Luftrausers is an oldschool arcade style game, with focus on racking up as many points as possible, while sustaining a multiplier. To do this you gun down hundreds of planes, ships, and various modifications and bosstypes of these.
The game does however feature some progression, in that you will be offered various jobs to complete, and by doing that you will progressively unlock parts to your plane, which comes with more jobs to do. There is also colourschemes to unlock, since the artstyle is uses a simple 4-5 colour pallette.
The unlockable parts gives a whole lot of vararity, and there's a bunch of different playstyles, depending on how you combine your plane. Personally I'm a big fan of the laser+melee body+booster engine combo.
Gameplay continues to be fun, and even after you have completed all jobs and unlocked all parts, there is more to do, a hardcore mode will unlock, which is really hardcore. You will basically die within seconds, and this mode comes with additional jobs to do.
Luftrausers is ultmatively a bunch of fun, with flying mechanics that feel really awesome, and gamplay that keeps on giving. It does however run in some wierd aspect ratio (most likely 4:3) and there is no way to make it wide screen as far as I have seen, but this doesn't really detract from the game in any way.
I would definitly reccomend this game if you are into arcade style games with scores and multipliers. Or if you just want to waste some time shooting thing out of a brown sky.
Go get it!