Great take on the theme, and awesome art! Got a highscore of 874 after I ran into an impossible level (all ×'s with two evens)
Thanks! Yes, unfortunately there is a small chance to roll an impossible level. I had originally planned it as a roguelike with powerups to help you get past such situations, but didn’t get to it in time.
Note: I believe All X’s with 2+ evens is the only impossible scenario. I did code it so you are guaranteed at least 1 odd number. I should have guaranteed at least 1 plus/minus.