As for the ball, I was quite confused how I am supposed to move it around. I think it bounces when I press space? When I got stuck in the wave I tried to rock it around using space, but it didn't seem to work. Sometimes ball would gain momentum, but sometimes it would not. Over time it the momentum gain would get weaker and weaker. Eventually it would stop reacting to my inputs and stand still.
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Ooh! A Down force is applied? It makes so much sense now!
The curve gets shallower on the bottom, so that is why I was getting less and less momentum.
I was also probably not very good at pressing down in a way to not cancel the existing momentum. Which eventually led to a ball resting at the bottom of the curve, not reacting to my imputs.
Maybe make the ball standing still (or moving very slow) as a lose state? So it resets and we can try again (or show a game over). Because I had to exit the game with Alt+F4.