I have not tried it yet, just read the rules. The point that is unstated, but I think should be, is that there is a direction to the closed loop, yet there are no arrows indicating direction in your example.
Yes, the lack of arrows is a bit of a limitation on the drawing facilities that I may try to remedy soon. I tried to point the direction issue out with the word “oriented” describing the closed loop in the main description; it’s now emphasized a bit more.
Interesting. I’m not sure if you meant it this way, but I solved this one a lot like I would a numberlink–meaning a lot more gut feeling and fewer well-defined progressions of steps. I’d say I used numberlink logic on about half the puzzle.