Platformer Toolkit is an interactive video essay, from the creator of Game Maker’s Toolkit.
You’ll get to see, first hand, how platformer characters are designed, as you use the toolkit to change and adjust over 30 variables that drive the hero’s movement.
Change Kit’s max speed, jump height, squash and stretch, coyote time, and more - and then play through a sample level with your chosen stats.
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It's also kinda backwards to have to change the character to fit the level design instead of the reverse... But yeah, it's about game character control, not level design.
I really recommend everyone, who enjoys game design I suppose, to play this 10-15 minute long game. This is a brilliant piece of gamified education. A playful peek behind the design curtains and efforts of designing a 2D platformer character, without diving too deep into the technical merits of one.