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I don't really think you should make it longer, but rather add some more difficulties. And maybe you could take away the timer - since the game is point based, it shouldn't really matter how long we take. I'd rather play to beat my high score than to beat a timer :).
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Goal is to point out, on the blank grid, where the requested symbol(s) are located, using the filled grid as your guide; eventually the grid is twisted or mirrored, and you must discover the change in order to place your guess correctly... and always, always, always keep one eye on the timer!
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Nice, but I'm not using my peripheral vision - I'm just using the sound you hear when you move over the boxes to locate the right sign... Well, blast me for cheating.
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Nice idea, though I got a little bored and finished only because I wanted to see my score. It got pretty challenging in the end!
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Would love to see an updated version: longer, more user controls (e.g., choose from among numbers, letters, symbols, and pictures), maybe some color, and maybe some different shapes instead of just one big box. Although the "one big box" approach does seem to be working here, so maybe stick with that and just give us more variation on the other elements.