I used WASD, the controls were really easy to understand. As was the core mechanic of going from vine to vine. You've done an amazing job introducing the mechanics with the right amount of time between them without causing an overwhelming feeling of new mechanics being thrown at the player every freaking second.
Love that every time I got a bit "bored" of the same mechanic, there was something new introduced. The fact you had to go back and forth was a nice touch!
This was the only time I was a bit puzzled as I didn't know exactly what was expected. The visible vine's on the top corner made me keep trying how to do a "double jump" instead of realizing instantly that I could have used the tiny ladders.
If you'd wanna make it easier, you could throw a banana on the first ladder step to make it obvious for the player that this is, in fact, a usable surface.
...But it might have also been intentional. In which case, good job, you made me think about how to go forward and actually learn. And the placement was early enough that it made it easy just to re-try.
You did use the mechanic of using a Banana to guide beautifully in the 3rd level where the banana was hidden inside the wall.
It was thoroughly good fun! With the few basic mechanics, you had, freaking 10/10! Great job :)