Okay...
It was okay -- its tough at first, but if you keep working at it...
Just go for a mage-type. As for skills, upgrade 'Enchanted Angel' consistently 'till just one or two Magic-Ups can max your dmg w/ the 5 mana spell (Damage caps are at 1000, 1500, etc)
Midway, it becomes very easy; just once you can max damage w/ one M-Up, start pumping up other stats (HP > DEF > MP > STR)
Right now about to head into The Void, probably gonna die since i forgot to continue onto other stages while it was easy.