This is Flow State!
It's a really fast-paced parkour game, with lots of tricks and mechanics. For example, on Prismarine,
you can not stop sprinting or you will have to restart.
At the end is a structure called The Gauntlet.
It's a massive parkour gauntlet with no checkpoints. Only 1 player has beat it thus far, IcyBlizzardPengu.
The game's not breaking many records unlike Isolation, but it is considered very fun!