Thanks brennanjeppson! So nice that you liked the vibe :)
Feedback is displayed in text above the creature: if you got it wrong, text should say that it's not enough, and if you got it right text should say "thank you" and the creature will walk away.
Or the problem could be that "E" button didn't work the first time you pressed it (you have to kinda spam it). We'll fix it in the future updates!