I suggest adding:
Ethereal Mirror - Reflects the damage that enemies inflict on you for 1-2 turns.
Ethereal Shield - Gives 2 defense to you and your ally's.
Normal Boomerang - Has 75% chance to come back but does only 1 damage.
Upgrades for everything - Ethereal costs some of your life and regular things cost money.
My friend Kloe and I would love to see these things in the game, of course you don't have to make them since they are just suggestions but we would really appreciate it.