I tried the ae ligature, long s, sharp s, Russian zha, Greek capital gamma, and a heart, and of those only the gamma was in the top five (it was #2); zha, ae, and heart weren't even in the list, and long-s and sharp-s were waaay down the list. (Actually, I just tried it with a better-drawn sharp-s and it didn't even turn up.) In some cases the top choices really do resemble the letter I was looking for, so that's fine, but there's a lot that shows up that resembles the canonical form a lot less than my drawing does.
So, not quite ready for prime time, I think. Cool idea, though.