Also add more classes!
For example, a rogue could turn into an archer.
The archer will have very long range in exchange for having a very small attack radius/arc.
Or you could also add a mage, he/she can attack a specific spot in the battlefield. And he/she doesn't even have to move. He/she has a countdown spell though or channeling (depends on the spell). Plus he's/she's got very weak defense.
This game has potential. May I suggest thought that you add some sort of team battles, like 3 on 3?
Also allow players to create guilds or something. Plus get rid of the random AI monsters. More power!
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