Like it very much, well done

Some good physics to frustrate the player with!

The controls feel a bit wobbly, and space seems to buff the jump...a meter, sound or color change of some kind would be nice for feedback

I can only give you 2/5 platforms for the theme, you've made mountain climbing more and not less difficult :)

A nice idea, though I would have liked some more variation. E.g. different heights to jump to, especially given the mechanic of charging up the jump and therefore having different jump heights. And to that point, having an indication of how far it's charged would have been helpful as well. 

I don't know if I actually managed to beat this; I got to what seemed like the top, but there was no ending, per se.