I downloaded and ran the binary. It's a pretty neat screensaver! Seems to work fine on Windows 8. It even looks good on multiple monitors, which is impressive for something from 2008.
I wish the author had documentation on the algorithm somewhere. The code has comments, but I didn't see anything that talked about the high level approach. The neat thing is that it makes a giant, random knot, but if you follow each thread it alternatives between going over and under each thread it crosses.
On the other hand, requiring reputation could incentivize spamming and worthless posts. For example, if you already have an automated voting bot, why not make it upvote your new bot accounts to transfer "rep" and allow more upvotes?
Piwik certainly has more features though.