Nicely written and clearly formatted! If I were to make any suggestions it might be to remove/replace the "The heroes may not be fatigued or shaken, and may not leave base-to-base contact with the other. " for the tie-breaker option, it would seem to limit selecting a hero unit that relies on maneuver versus tank approach (maybe an alternative win condition like first to wound in the 4th round wins or something), but it might not be a condition that comes up much (I do understand the rule is meant to force an end to the game, but just feels a bit like a complicated roll-off by chance versus being able to do a David & Goliath type event).