I haven't been able to run it on OSX, but I really like what you have in the gameplay video -- the art design is really great, and the gameplay looks simple and fun. A great jam idea, and very well executed! :D
Have you thought about being able to attack the opponent somehow, perhaps even if it just slows them down for a second? It could make being near the other player a bit riskier, and add an additional strategic layer to the game.