Cave's shmup ports are decent, because you can use a touch cursor to zoom around the screen with a flick of the finger. It's not at all faithful to the arcade and console versions, but unlike a virtual d-pad, it actually works.
The Neo isn't getting another fighter. There aren't any homebrew developers that are up to the task, and SNKP resuming support of it would just be throwing money down the drain. If you want more fighters in the Neo style, I recommend Dark Awake, Chaos Code, and the UM versions of KOF 98/2002.