Already commented on Reddit, but just wanted to say this was a great activity for myself and my two boys (aged 7 and 5). We made a three-player board, 5x5 but the center square is blocked off. Excited to make more cards and try new strategies.
I also replied to you on Reddit, but I'll say it again. I'm so happy you and your kids enjoyed the game! Be sure to share anything fun you make or discover!