quick question about the rules:
It’s not said, but I think it’s better to explicit it: can a piece capture another that is not carrying the ball? (in the Rugby game, it’d be a foul)
On another note, it’s fine that you’ve removed the mention about the hourglass: that’s not working, because when you return it, the remaining sand may not be equal to 1mn for the next player’s turn.
Anyway, great game, I wish I could try it!