This was really fun once I got the hang of it. The vines and the bending branches work great.
I know the controls got a couple people confused, I was playing on Desktop and confused me at first (I had ignored the information in the title screen). Clicking on the monkey wasn't that intuitive, might have worked better with right click... though if this was intended for mobile I'd suggest making making the monkey release when releasing the drag (and adjust the physics so that it's more about gaining momentum and using the branch springiness rather than quickly dragging and tapping the monkey).
That is to say, with a little bit of adjusting, I feel like this could be the basis for a good game. Feels like a successful prototype to me. And it's already pretty polished!
Sad that the monkeys couldn't hang off other monkeys!
I personally think it might have been even funnier if it were Tarzan-like people swinging through the jungle and trying to get bananas. i.e. people behaving like monkeys is funnier than monkeys behaving like monkeys.