Reminds of playing 'war' in school, where you'd make the little hash and extend the line with a ruler to see if it hit your opponent's guys. Nostalgia points! 

Advice for getting the most out of a game jam on Itch.io

• People want to try and play your game, but if it is not obvious visually, please always add basic instructions to the game page. 
• Always add an image, even if it is a screenshot, because when presented with a submission that has "no image" (thumbnail), what does it say about the person's effort?
• Jams are a great way to learn and get feedback but do attempt to stick to jams' rules and theme. Most jams are pretty liberal in interpretation.
• There is nothing wrong in posting two submissions to a jam (if rules allow), but posting almost identical games is not.

I assume you are new and possibly relatively young, so give this advice not to be mean but for you to improve in future jams. Making mistakes is how we learn.

I don't understand how to play it! :D

And I could be wrong, but it doesn't seem to fit the theme of this jam at all.

Anyway, congratulations on your effort and for participating in the jam.