You play as the cute glove critter thing, jumping through the cheerful land, collecting gems. You also have the power of 'eversion' in certain locations to change the terrain. For example, one change will make clouds solid so you can jump on them and reach gems you couldn't before.
It's a short game with 7 worlds, but it's worth a quick play through.
It's full of stars!
Do have some complaint of frequent game crashes, but it saves regularly, and you can select the world from the starting screen, so it's not too bad.