Therapy Katamari! Excellent idea! You have to roll up all the shrinks and couches you can find!

Also, obviously there would be gold busts of great therapists. And you'd start out at a size where you could only roll up psychology books.

I can even see the intro text (it'd be from the second one, of course). "Your Highness! I am a counselor, and I love Katamari Damacy. But I think you and your family need more help than one therapist can provide." "Nonsense. The King is the model of mental health! We are the standard by which others are measured!" "Your Highness, you are clearly the smartest man I have ever met." "...Smartest man...Okay. Prince, get therapists!"