Was a little confusing in the beginning, but once we got used to the movement, it was pretty fun.
Felt that it got too easy when the length of the tongue increased, though. Maybe you could try to set a fixed a length and increase the difficulty with some level design magic.
Also, it was a little hard to tell when the chameleon was fully attached to the walls, maybe its just that it takes too long; but we liked the possibility of releasing the tongue mid-air to achieve some pro maneuvers.
It is a nice and interesting concept and really liked the style.