Ty for the feedback!
Yeah, in hindsight I could've made the board a bit smaller to make engagement with the enemy a bit quicker. I'll keep that in mind for future updates which post-jam.
As for if there's any way to unlock additional boards/cards, yes and no. In the code and in the editor, the password system worked fine and included ways to unlock extra content, such as boards, cards, and customizable card colors. But once I built the project out, the system just wouldn't work the way I wanted. I plan on fixing that with future updates, as well.
I'm glad you enjoyed my project!