I'd love to see this with official Steam Controller touchpad support, i.e. the position of your thumbs on the pads are mapped directly to the vertical position of either side of the bar (with some additional smoothing obvs, since thumbs are not perfectly still) :)
We've experimented with similar control schemes no mobile, but unfortunately they don't quite gel with how the input in the game works. One of the main movement mechanics is holding up at the same time on both sides of the vine, and if the sides are mapped directly to finger input then you get a really awkward rowing motion when trying to move up simultaneously (if I'm reading the idea correctly)