Interesting concept! Very fast paced, took me a few attempts with instant death before I understood it, but after that it was quite easy (as a solo player, can't imagine how it'll play like coop but the way to win is the same). The trick is to have one little guy jump an extra time at the start, and then just sync jump both of them continuously in a rhythmic pattern twice per wallbounce. They'll never crash into each other and coin collection will happen automatically and I maxed out the score after that. I'm not sure how to "fix" this problem without changing the game completely, but it was fun beating the game :D
Good job!