Archers are your friends. As soon as you can, place some around the village. They will fire at anything that gets too close.
Cheat Codes
Start up the game. Go to the main menu. Tap the Pachinko machine minigame. Press 'help' and then tap the coin counter at the top right corner of the screen. This will prompt a menu where you can enter passwords.
Effect
Password
Fully upgrades bow and arrow
WAKE UP
Fully upgrades sword
SAMURAI SWORD
Gives 250,000 coins
GLU GLORY
Unlocks all cutscenes
STORY TIME
Minions
Running away and letting your minions take a beating is a perfectly legitimate strategy if you need to heal up.
Special powers
Do not worry too much about conserving your special powers. The cooldown times on them are short enough that they will be charged again pretty soon.