Danmaku Unlimited 2 is pretty freaking good. It has incredibly responsive controls, a rockin' soundtrack, patterns that are very hard to learn, and an absolutely fascinating combo system. You either get up close and personal to the baddies, risking death for a larger multiplier, or you stay back and earn a wimpy-dimpy high score. The Burst mode is another twist, where getting close to enemies now gives you meter for a giant laser beam. Said laser will proceed to wipe out almost every bullet it hits, and give you a multiplier based on that.
DU2 is also abound with customization. You got the standard wideshot, focused shot, and tracking shot for your ship, and you can spend points to upgrade their effectiveness. The way you level everything up is nice as well. As you progress through the game (and inevitably die), you'll rank up and that gives you points. These points can be spent on the three addons, giving your ship more hitpoints, more lives, and continues. Points are never lost, only spent, and can be retracted to spend on different parts. At the rank of Major, I prefer having full life points and as many lives as I can. DU2 allows for intense customization options, and lets you personalize your playstyle to a great degree.
I'd say this is the best $5 I've spent on a game in a very long while, and is well worth it.
Update : Finished the game.
i hate this game so hard, but it's so good.