Heart Slime

Restores one of your lost hearts in Casual Mode.

The Heart Slime is the rare lifeline of Casual Mode. Popping it restores one heart, up to the maximum of three.

How it works

Appears only in Casual Mode, at about 3% of spawns.
If you are already at three hearts, nothing happens.
Like every good slime, letting it expire costs you a heart, so a missed Heart Slime hurts twice.

Tips

If you are on one heart, a Heart Slime is the top priority on screen.
Do not let a screen full of other slimes distract you from a heart when you have lost one.