Well I'd hate to see your fine offer go wanting. So I just went and clocked Blow Stuff Up (yes, we should do a remake/update in Unity. There is a good explosions library available) and The Kiwi's Tale. Of course, I did help make one (but only one) of those games.
Here are the screenshots:


Hmmm... Now, how to abuse the power that I now hold over you (John Romero style).
i want you to... bring me a shrubbery! No - wait... write 50,000 words in 30 Days.How about that ridiculous PieMan game that your brother came up with?
Actually what I want is a game where the player can "jump back in time", taking with them their health, powerups, knowledge and then play alongside themselves maybe 30 seconds or 2 minutes earlier.
That's the basic concept. I have heaps of other ideas as to how to make the most of that idea, but let's see what you make of it.

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Global Game Jam 2012 Retrospective