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You could chang your letter I to have horizontals bars at top and bottom or for the 1 put a pixel on the top left. for the O or 0 on one of them you could take the four corner pixels away. For the Z move the bottom brown pixel to the left and remove the two lighter brown pixels underneath. For the S try removing corner pixels to imply more of a curve.
Neat idea. Just played around a bit with this and managed to keep it at 24 tiles but making it over all look nicer and minus the weird L.