I agree it's confusing at the beginning, but I think it's much better to figure out the rules on your own. It requires a bit of testing, but it's completely doable.
I'd add a line below the game, e.g. "Your first goal is to figure out the rules. Click here if you're still confused after a while."
I'd add a line below the game, e.g. "Your first goal is to figure out the rules. Click here if you're still confused after a while."