Gonna shill for Noita here, a FANTASTIC roguelike by Finnish developer nolla games. It's not for everyone, but if it's for you, whoooooo boy.
It's got a Custom engine where every pixel is simulated, and a really deep spell crafting mechanic. Tons of secret/"endgame" content based on the premise players will break the game using the spell crafting mechanics.
Beating the final boss is considered the tutorial by the community and covers maybe 10% of the content/achievements
It's wonderful.
Athletic skill:athletic feat isn't a linear scale - Phelps might not be 67x faster than you but he is absolutely 67x(+++) more skilled. There's pretty much zero chance you pick up a win vs him unless he dies mid race or something