Stats are random in every game, and with each level, only certain stats are guaranteed to go up, so for instance, level 2 might mean a guaranteed increase in Strength and Luck, but you'll just have to cross your fingers for Vitality/Stamina and Intelligence.

The optional dungeons are pretty easy, just have some annoying puzzles. Oh yeah, and there's Shinryu and Omega. Those buggers are pretty unbalanced.