Yes, the source file separates the icon from the numbers, so you can draw your own numbers on top. I didn't use a font though, it's my personal handwriting, but the source file also includes the numbers 0-9 so you could use them to create arbitrary numbers (probably have to reduce them a bit in size beforehand).
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Wow thank you for the fast reply. You have beautiful handwriting :)
I just bought all of your asset packs, even though I won't be able to use them.
I hope you'll be able to make a font with your writing (letters, numbers, symbols), and a top-down square version of your hex tiles in the future! Keep up the great work!