I want to recommend Snake Galaxy. Posted about it a couple of pages back.
I'll just copy what I wrote on T-A, a couple of days ago:
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I've opened up the six worlds and must say that I'm very satisfied with this game. The visuals are stunning, the textures on the planets are varied and it all looks great (I think it'd be a good idea to have the same "snake" through all levels though, not themed to the planets textures, give it a feeling of continuation by having the central character stay the same throughout the game, if that makes any sense).
The controls work well (you touch the screen where you want the snake to travel).
The best snake game I've played in... forever? I wasn't sure that a snake game would hold any interest for me now. I mean, the original game is a classic, but the concept hasn't really been developed into something new (at least that I've seen) since then. Snake Galaxy is a great update of the concept, the added dimension of travelling over spheres makes a big difference.
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So, yeah. It's snake on spheres. And I can understand why that doesn't sound fantastic. But it's a good game and the obstacles on the planets, combined with the combo point system works great.
The six worlds won't take long to complete, and then it's a matter of beating your highscores. I'm hoping for an update with online leaderboards, but if no one is playing the game, it wouldn't really matter.
Found a new video on Youtube. This shows off the 2nd and 3rd planet. The best ones, in my opinion, is world 5 and 6. But this will give you all the information you need about the game:
http://www.youtube.com/watch?v=x4A5QZGjJ6E
It's $3,99, and I guess that may seem a bit high.
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=311473618&mt=8