You don't have to use the Life Essence (hearts) right when you get them. You can merge them for more powerful "Life Orbs"!
Drag the Life Essence near other Life Essence:
Sit back and relax while they merge.
Voila! You now have a Life Orb that can heal as much as 4 hearts!
Go crazy and keep merging Life Orbs to get even more powerful Life Orbs!
When you're ready, tap the Life Orb to unleash a land-healing bonanza!
How powerful of a Life Orb will you discover?