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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Hmm, APDS-9960 looks fun - but it only has 4 sensors so while it does up/down/left/right, an actual image is a bit beyond it!
The last link uses another mouse sensor, the ADNS3080. It seems difficult to buy just the chip one-off, but there are at least some modules on eBay for sensble prices.
That's probably the best bet at the moment - and it comes with a lens that'll focus further than a few inches (I guess)