I think the concept is interesting, but the game itself is kinda lacking. Controlling one at a time is simpler to understand, but makes avoiding damage harder than controlling both at once. The player has so much health that the best strategy was often to just tank damage and not worry about actually avoiding the enemies. Also, there's not much indication when you've won the level. The level transition happens after a delay, so it doesn't feel quite as connected, and there's no animation or such for having both reach the end. Something to tell the player they won the level would have been nice to see.