I honestly didn't think you could make a game out of VENN diagrams, but here we are and it's pretty great! There's not really any reason to not just wait for the red dots to go by though, maybe have like a timer that you have to replenish with normal dots, so that you can't just wait out the red ones. But then again, I'm not really one to tell you how to make your game, take that suggestion as what you want it to be :D