Marble it Up is an enjoyable game, but the short length might turn some people off, especially for its twenty dollar price point.  If you're someone who is constantly trying to better their times in games with time trials, or you're a completionist that just has to unlock everything, Marble it Up will definitely keep you busy trying to find new and interesting ways to finish each stage as fast as possible.  Otherwise, the minimal content might turn some off for now, enjoyable as the current amount of content might be.