During your adventure, you may encounter some jelly like creature called Chu which come in different colors and have different effects. Below is listed the color and the effect of it.

Red Chu:Restores 8 hearts.
Blue Chu:Restores all hearts.
Yellow Chu:Lantern Fuel.
Purple Chu:It can restore health of make you lose health.
Rare Chu:This Chu is a golden color. It restores all hearts and ups your attack for a little while.