If an environmentally friendly group of alien programmers had written Angry Birds Space, it might have turned out much like Solar Flux HD ($3.99). Instead of destroying pig domiciles in the far reaches of the universe, you need to heal ailing suns through clever manipulation of your spacecraft.
The game is 226MB in size, so you might want to grab it through iTunes or Wi-Fi. When you start it up, it walks you through the basic tutorial levels to teach you how to control the ship, collect plasma fragments, and use the various gravity effects to score on each level. The game ran pretty well, though it seemed to take longer and longer to load as I progressed.