Really my only complaint is the tiny game screen. I would LOVE for a full screen option. Plus some other handy enchantments are the HP/SP return after killing enemies. If you die and return through the save and quit option, you can just go kill a bunch of weak monsters for easy health gain. Also comes in handy when fighting mobs too.
The thing I dislike the most in here are the ninjas, their smoke bomb ability makes them a little broken. In five seconds they get from the gem cave and near the exit without a scratch. The only way I know of the get rid of them is a ballista tower or the fireball power.
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If anything, it's a rip-off of Ratchet and Clank, Fallout and Madness Combat.