This was a really cool spin on the falling block puzzle genre. The tutorial had me a little confused at first, and it took me until after to realize that all I really needed to do was form math equations with the block lines. But once I got that down the game became a lot of fun. Having to balance between setting up lines for attack and defense was also a nice touch.
My only complaint is that at one point my lines got pretty high up, almost to the cutoff line for defense. And as I was trying to clear a horizontal line that high, it instead kept clearing vertical ones. I guess the game prioritizes clearing vertical lines over horizontal, but that can sometimes lead to you being stuck in a loop where you can't get an attack going.
Otherwise it's a really cool game, I'd love to play the finished version when that comes out.