In my short web programming career, I've found two things that I really like: Clojure and Ruby on Rails. This is my attempt to put the two together in a tasteful, clojure-like way.
I also wanted to say more generally why I don't seem to make backwards compatible upgrades. Well, two reasons:
1. I'm usually working on new, backwards incompatible websites.
2. This is a web framework for indie hackers. The faster you can get to validation, the better.
So every new name (delta -> epsilon) for example is always a breaking change. If you're on the same name, it never has breaking changes. Keeps things pretty simple. If you aren't an indie hacker or if you've moved past the part where you're trying to throw stuff at the wall to see what sticks, this might not be the framework for you.