iPhone app idea: 'ground control' side-scrolling car game

Some iPhone app ideas. Feel free to make use of them. If you do, an acknowledgement is all I'd ask. I'd play around with some of these ideas myself, but my PhD is what I need to focus on at the moment.

'ground control' 2D side-scrolling car game

In this game the player doesn't control the car, but the ground level. Sliding their finger up raises the height of the ground at that point, and also increases the slope of the ground leading up to that point. Sliding their finger down lowers the ground level.

The screen is constantly scrolling across with the car always moving forwards. The car might always sit about 1/3 in from the left of the screen.

Steeper uphill makes the car move slower. Steeper downhill makes it go faster. A small uphil can be used as a jump, making the car fly through the air.

These techniques could be used to make the car avoid static and moving obstacles, jump over crevices, etc.

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update, 02 Aug 2011: I just heard about the game 'Bumpy Road' which works using this kind of mechanic (see the video on the linked page). It seems to use the mechanic in a different way, though. It seems it as effectively like an alternative to having a 'jump' button. I was thinking more of it as a way of changing the landscape ahead of the car, to speed it up or slow it down or to create ramp-like jumps.

update, 10 May 2012: The iOS game Contre Jour involves a mechanic where you raise and lower the ground-level.