Interesting concept! It took me some time to figure out that shorter the distance, slower the speed, so I only started scoring when I notice that.
If I could give one piece of feedback, I think just passing through the portal should be enough, so we would score "faster" and keep going. There could be a time limit and passing quickly through portals could give more points. But I do concede there's some interesting thinking going on when you have to predict where you're gonna land after 3 bounces.
Good job!