Abalone or Stomatella? Neither fit the appearance.
It's about 1/4" right now and stays out in the open on the glass.
That pic was taken with a 40mm macro.
If it has a stomatella-type shell but most or all of its foot actually fits under there when extended, it's a limpet. That appears to be the case here, so I'm about 95% sure it's a limpet.
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