I loved the game, a bit too unforgiving, like in this case that I hit the platform but still fell.
There was a bug and I got 81 souls instead of 80, giving me the bad ending.
But overall a very solid game, with great mechanics.
To the dev, maybe consider adding some accessibility options to make the jumps more forgiving or the ball more bouncy on the black platforms, I know this is a game about frustration, but others might enjoy a toned down version.