You followed an idea to its execution well. I think you should rewatch "Follow the Fun" by Mark Brown - rather than focusing on your idea - which may seem good but in practice not so much for the player, focus on gameplay! The most sustainable strategy for me playing this game was to get both characters to run in circles around the map together collecting more health. Defeats the point of having two characters! Basically the mechanics create dynamism and interesting balances to manage, but the actual gameplay of managing that balance should be improved.