I can't believe nobody has rated or commented on this yet. I had a blast!
Very creative idea of accumulating cannons along whatever side you roll on to them. I enjoyed getting a single side of my die loaded up and then sniping one of the enemies from across the map. The art also looks super cool, it has a very distinct style to it. Overall just a very well-executed game.
One bug I spotted was that your score does not reset when you reset the level. Not a big deal, but I thought I'd let you know.