So far, only Rusted Moss and Silksong were worth my time among the platformers I tried, which included the original Hollow Knight (platforming is too easy), Celeste (too easy A-sides, unfun B-sides) and Animal Well (too easy base game, too cryptic post game).
Don't expect too much of Rusted Moss if Silksong is kicking your ass. Silksong is the easier game. I like Rusted Moss because movement reminds me of the Umihara Kawase series, but it's not for everyone.
If you like 2d platforming exploration types, try Hollowknight, Celeste, VVVVVV, Ori, Animal Well. Each one is fantastic.