Emotions can be obtained by Dr. Shrunk. You can express these emotions by pressing select then touching the emote icons.You are only allowed 4 emotes at a time. The following are the emotions you can get in this game:
Anger, Shock, Laughter, Surpirse, Rage, Distress, Fear, Sorrow, Bleakness, Joy, Confusion, Inspiration, Happiness, Thought, Sadness, Disappointment, Scheming, Fatigue, Love, Contentment, Irritation, Discontent, Shyness, Disbelief, Agreement, Approvel, Acceptance, Exasperation, and Realization.
There are also a few more that can be obtained via hacking