#1 : When you are battling using the touch screen, the best way to attack is with good defense. If you time a block correctly you'll temporarily stun your opponent!
#2: Always break everything you see. Inside baskets, barrels, or treasure chests may contain help items or coins!
Go into an alcove which enemies spawn out of, and hide there until one comes out. If you're back enough, He will spawn in front of you and you can kill him straight away with a surprise kill. Just get away from the ones that explode.