Amidst the Sky is the one you're thinking of. Casper has several of these fantastic platformers, with various degrees of skill vs puzzle content. These two are on the "completely skill-based" end of the spectrum, along with Soul Mirror. If you want a more even balance of puzzle vs skill, try Temple of the Four Serpents and Tower of the Scorched Sea. If you want puzzle platforming with a much lower skill barrier, try the two Cursed Travels games. And if you want no platforming but plenty of puzzling, go for Lost in Firefly Forest.