The description from Disney:
Wander Over Yonder – Galactic Rescue
Help Wander and Sylvia high-five the galactic citizens and rescue them from Lord Hater’s negative emotions!
Update: Or play it right here on Tumblr.
Here’s also the music from the game:
Here also the sound effects, in case you want to use them as notification sounds for your phone, instant messenger, email client, etc.: balloon-pop-1.mp3, balloon-pop-2.mp3, balloon-pop-3.mp3, balloon-squeak-1.mp3, balloon-squeak-2.mp3, balloon-squeak-3.mp3, blow-bubble.mp3, bubble-up.mp3, click.mp3, electricity.mp3, hater-1.mp3, hater-2.mp3, hater-3.mp3, hater-fly.mp3, hit1.mp3, hit2.mp3, hit3.mp3, hit4.mp3, hit5.mp3, jump.mp3, laser.mp3, pop.mp3, power-up.mp3, score1.mp3, score2.mp3, score3.mp3, score4.mp3, ship.mp3, slap.mp3, slide-down.mp3, zap.mp3.