Playing Yoshi's Universal Gravitation reminds me of playing racing games before I'd stopped impulsively twisting my hands like the control pad was a steering wheel. I love it that way. It's old but new.
Thanks to the addition of a tilt sensor embedded in the cartridge, it comes off as a basic 2D platformer - D-pad to move, A to jump, B to swallow - riffing somewhat on Yoshi's Island but with a twist that truly levels the playing field for all. And then rocks it back and forth like a seesaw.
It lets you alter the centre of gravity to affect your platforming abilities, and it's the sort of fundamental shift that the genre's been crying out for.