very cool! Smart idea--I wish Noodles were more brave about new stuff! She hates swinging perches but she loves to swing upside down and swoop around on my fingers...argh..
I like how you hung the toys off of it.
If that rope seems too loose at points, you could try wrapping vet-wrap or something over it to keep it from unraveling (my class did and art project that required them to wrap hula hoops in twine and if the end came undone, the whole thing started to puff/slide due to the slack.
Heck, vert wrap could even be used by itself if you wanted--it's cheap in bulk on Amazon.