I may be wrong, but there is a part shortly after eating the magic "herb" and everything changes where continuing isn't actually possible as far as I can tell.
SPOILER...

Very fun regardless, but I'm not seeing how to progress here. Maybe I'm just dumb.
It's possible kinda hard but possible, you need to make a walljump (I was stuck in that part too) step 1 (red) : jump in the first block. Step 2(blue) : make a walljump like in the image. Step 3 (green) : jump over that