This is a sixth grade lesson, so you probably know it, so consider this post to be a review, or something to show your fifth grade friends.
“Well” goes with verbs, things you do. We call it an adverb. It tells how you do something. My wife cooks well.
“Good” goes with nouns. We call it an adjective. It tells what something is like. My wife is a good cook.
So the robot, of all people, gets it wrong. Next-to-last panel. He’s telling how it worked out, so he should have used “well.”
One exception to this rule: “Well” is an adjective when you’re talking about health. You should say “I don’t feel well when I eat too much.”