Chillingo's Feed Me Oil was released a little while ago, and it's a solid game that didn't get a ton of press when it first dropped. The reason for that is probably because it's somewhat similar to Where's My Water, in that you're trying to get a fluid simulation into a certain place on the screen by tweaking physics-enabled objects in the world. But while Where's My Water was all about digging, Feed Me Oil is much more about creation -- you place objects like platforms and wheels in the world to try and get the "black gold" flowing where you need it to go.
Like pretty much all of Chillingo's other titles, there is lots of content here to play through: Lots of levels and puzzles with an increasing number of objects to use and move around to your heart's content. And while the game is on the iPhone as well, it's much better on the iPad -- the graphics are bigger and the objects are easier to manipulate in the game's space. Feed Me Oil is an excellent game, and especially because it's on sale today for completely free. Check it out.