Neat idea! It's simple but very effective - and I really enjoy the detail of the benches and the tree. Very nice. I wouldn't add it to any of my sites due to the unmoderated nature of it - seeing some fairly unsavory things in your demo - but that's just a little tweak, I'm sure!
If your website attracts such elements perhaps there's a reason?
The demo is attracting the HN crowd and it’s getting… well, let’s just say this crowd is about as good as it gets online.