Its a pretty good side scrolling game reminiscent of Shinobi. You have a nice assortment of weapons/moves, you can run VERY fast, and walk up walls and stuff. I enjoyed it, but some of the bosses take a lot of skill to beat. (which is always a good thing IMO) Overall I was impressed.
Kinda surprised that Square-Enix localized it, even though Taito made the game.
The original Arcade game was good but only if you have fond memories of it, the NES version wasn't good whatever your memory. This game was great for me, finished the Japanese version and then finished the North American release.