About stun and berserk type of states. If an enemy can stun the player, and the player can't move for a turn, even being the only player, I think that's acceptable as long as the enemy can't spam it and the player doesn't keep getting stun non-stop by other enemies. If it happens regularly or just slightly frequent, then yes I'd agree then it becomes more annoying. But I think otherwise a stun state could still work. Berserk is more tricky but can work. If it lasts a single turn and doesn't happen frequent, or it's the player choice to add the state, then I think it can just about work and may be of use in the game. About class skills, customizing skills and skills upon level up. I'm not sure if you want to do this either, but since you've got a single player you could either give that player the ability to change classes or give that player many muti-class skills and let the player customize them. A player could equip skills through equipment or gain many skills upon level up but can only skill-equip some of them. You can mix or match it too, I.e. For example, the player learns some skills upon levelling up (I recommend this, having level up skillsets) and then the player can equip more skills by purchasing certain accessories. (Personally I like that type of idea). Just trying to find some suggestions and thoughts for you there.