The Sleeping Prince: Royal Edition, by Signal Studios, has gone fully premium and done away with in app purchases. The evil Sydney Slime has cursed the Cloudreach Kingdom to sleep, and as Prince Perilous it's your job to save them. The only problem is that you're also cursed. Use the prince's magic to fling him through each puzzle and rescue Princess Leona.
You can download The Sleeping Prince: Royal Edition for $1.99 (and nothing else) now.