And the information you provide below is good (it provides a bit of "braggy" info without giving the answer away) but I would make it more conversational, e.g., "I beat Dad!" and then "I beat Dad again!" and then "I'm on a roll... I beat Dad 3 times in a row!" and add a call to action like "Can you beat Dad too? Try here: https://dadagrams.com".
The "Dad" emoji is chef's kiss. Definitely keep that in the share message.
For reference, here's the current share message (minus the great emoji, which apparently HN does not support):
#dadagrams14
Today: Won by 2 points
All time: Winning by 2 points
Daily streak: 1