Concept is good.
Switching back and forth during jumps was tricky and interesting.
My complaints:
-The game feels lifeless. Some more things moving, some juice additions would be nice.
-The character doesn't have an idle animation. That would have really added some life to the game.
-The character and ledge collision cause me to slide off from time to time.
-A jump that changes it's distance based on how long you hold the button is nice, but I didn't really use it. I just held down the jump to its fullest duration for just about every jump. Thats either the fault of level design, or the jump itself needing tweaking.
Otherwise:
I like the mechanic, the aesthetic, the story, and the music/sound.