IF it is a complete set by itself, and tells a succinct "chapter" of your story by itself, you should release it sooner than later. As Valve states on the dev wiki, Release early, Release often. This allows you more feedback, and I believe you should have the option to go back and fix your work later, should you choose to.
Just my personal philosophy.
Talia
Talia joined
I have been experimenting with level design for over a decade now. Most of my projects are in improving gameplay and flow, and studying the psychology of flow. Risk/reward patterns, geometry, economy, and game theory are just a few of the things that float my boat. Currently I am working on a new project that I hope will allow me to explore many of the things that weren't sufficiently explored in my pet engine's flagship title.