Some of the potions seem silly. I can pay 330 for a stat change of 1hp and mp or just as likely def and mdef. You also pay 380 gold for a potion that can often be found on the floor which could likely screw you over. I found the skills had limited usefulness, and that the only way to spend money was on hp and wpn upgrades.
The game works, but It needs to be tweaked to give real value to each play style and items. I did love the 4th class you made though, that was a real cool concept!