Arrow keys to move, pressing X will set your health to 60 exactly once, which can help you or hurt you, so use it well. Space bar to attack the heart after each attack. Heart damage needs to reach 150 before you can win. For returning customers, the wonk attacking and movement is fixed.
This fight is an extra to a three-phase Corona boss fight that just REFUSES to work on the Scratch website, though I'll try to get it working. Update: Wahoo! It works! https://scratch.mit.edu/projects/557419815/ <--Here!