I picked up the Alltynex trilogy from Gamersgate (DRM-free) this week (20 bucks for 3 shmups, not a bad deal!).
Haven't touched much on Alltynex Second yet. Apparently it's a remake of the original. But it's in 3D

((
RefleX is great, I love the shield system. Deflecting shots back, and having to let go of the shoot button to recharge it back faster (though it recharges slowly over time even if you keep shooting), there's a nice learning curve in terms of using it at the appropriate times without draining it too much.
Kamui is great too. So there's shot, and a lightning homing weapon (that attacks targets in the background in a different plane) which has an energy bar. It recharges naturally. The more energy you have, the more lightning you shoot out. Pressing both buttons gives you a straight mega-beam that cancels bullets it hits, but you can't keep it up for more than a few seconds. It actually uses the same energy gauge as the lightning, but in reverse - it brings down the max energy value that the lightning bar can recharge up to (this goes back to normal within a few seconds, though). So there's a nice balance between using your weapons optimally; the normal shot, destroying targets in the other plane via lightning, while keeping yourself alive with the beam at opportune times as well.
Music is pretty neat as well!