This is exactly my type of game! Interesting use of "mode" and I'd love to see that idea explored more. plus combining tanks is cool. I think more tooltips would help, kept forgetting what was power/range/cost, and which grit did what. ...and I didn't catch you could add new dice until way too late in my first attempt.
There is a huge amount of potential in this concept, I wish I had more time to learn each of the mechanics and strategies.