Hehe, cute and funny :D
Congrats!
Maybe you can add other bonus/malus items (invert commands, faster/slower movement).
And also, make it so that the attack mode has a short duration, but you can make it last longer by taking new attack items (or by stacking several bonuses you can get stronger and beat other attack modes... then the other player may still find a defense item to cancel his attack and negate yours).
Thx for contributing!