I'm really enjoying this! For one, the fact you've managed to communicate an entire space and event with one low res pic of a crowd and a few blocks of colour is really impressive. The sense of acceleration is surprisingly tight, and you have nailed the arc of the little cubes jump. I get so hopeful watching it rise in the air, and I always just end up proud of it by the time it lands. Plus, it always felt like the foul line came at a slightly different time, which I can't say for sure is true, but is more to say that it never lost the tension of the first run.
If I could offer some space for improvement, the main one would just be a way to fix the bug that prevents you from running if you let go of space, as it made multiple runs difficult at first. More than that though, some way of panning the camera from run up into the jump would really help unite the two emotional arcs of each stage, and better show off how my run affects my jump. This would also mean that you would get to see yourself foul, as opposed to cutting away from the foul just as it happens.
Overall I really want to stress how fun this is, you've clearly nailed some numbers and physics on the backend, and the lack of visual fluff highlights that rather than distracts. Really wonderful job!