I defeated Enuo and Neo Shinryu (Dual Wield Dragon Lances and Jump, it works). But I never was able to defeat Omega mk II. I'll try that dude later.

Enuo was tough, cause I didn't have any protection against his Dance Macabre or whatever it is that zombies you. Next time I face him, I'll have those rings that potect you against zombie. Awesome optional boss he was.

Neo Shinryu was surprisingly easy because of Jump with Dragon Lances. But I don't even know how I survived his megaflare and whatever else it was that he uses when he dies. 0_o