Game feels like straight off from a retro console, lovely job with it. That said, coyote time I feel like a modern feature we should not ignore for platformers.
Levels felt great, puzzles were cool (that said the little floting rock guy sometimes doesn it when I feel like it should, small hitbox maybe?).
Graphics is super duper neat, looks so retro that my lcd almost became a crt.
SFX and music are great, worst thing about them is the volume level. Also udpate your page, you support wasd an jkl yet it is not shown! :D
Beautiful entry, lovely work on it!