You'd be better off with Final Burn Alpha X if you enjoy shooters like that, Freakycody. It can play all of the shooters that Kawa-X plays, as well as a few non CPS 1-2 / Neo Geo games, like Do DonPachi, and EspRaDe.
However, if you'd like to simply stick with Kawa-X, I'd recommend the Sonic Wings/Aero Fighters games on the Neo Geo. On the Capcom side, there's Mars Matrix, GigaWing, and Dimahoo. Be warned, the Capcom shooters get REDICULOUSLY difficult, to the point where you will die just a stupid amount of times.
I'll also recommend a rather strange "shooter" on the Neo called Twinklestar Sprites. The best way to describe it is a "competitive shooter." It has that annoying japanese cuteness to it that drives me insane, but the game IS fun, especially when played against somebody. You WILL fear the fuzzy onions (play it, and you'll know what I mean.

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