How did you get past 20? After eating the second white dot, the fruit-snake can't be bent at all. Even if I turn immediately before eating the second dot.

It turns out "Always" clycles in construct are framerate dependant (Which is V-synched by default), while the movement of the snake head itself is determined using delta timing. In the way the game was programmed this would cause the "tail" of the snake to, at framerates higher than 40fps, generate closer to the head than intended.
I think I fixed it now so it should play as intended on any framerate.