It's a start
Not exactly the most entertaining thing ever, seeing how it's just an RPG battle engine and not really an actual adventure.
Couple bugs:
All the spells were available from the start and you never had to buy them. So that means concentrate + most powerful spell you have the MP for = oneshot opponents several levels higher than you.
Million Volt cost about 40 MP more than its advertised value. You could still do it at the advertised value but it left you at negative MP if you didn't have the excess :/