Thank you, glad you liked it! I agree with you about those improvements! I really did want to add in a few more things to polish it, but, as you probably guessed, I just ran out of time for the jam and submitted this version.
One interesting thing I discovered in playing it is that, because of the way the physics works, the balls that get stuck can continue to very slowly squeeze through tight spaces. I discovered this after stepping away from my laptop and, right as I walked back in, a ball got dislodged and fell into the goal. So I almost wonder if putting a replay button in would end the game prematurely? Although I think most people playing a "20-second" game wouldn't have the patience to wait an hour for a ball to get unstuck 😄