Cave Story Beta Information
After a question about a "cave story beta" was posted on Pixel's BBS he released a set of images relating to a 2003 beta of Cave Story, since then more images as well as video footage have surfaced over time. In these images it is notable that Quote was originally named Curly Brace, Balrog was a basic common monster, and Cave Story was a completely different game. A request for a release of the beta was turned down by Pixel as he felt the beta was too buggy for a release.
Beta music can be found on the beta music downloads page, whilst tracks that weren't used in the final game can be found on the music downloads page under unreleased tracks. Some very early tracks can be found bundled with piyopiyo player.
Click on a thumbnail below to see the full image.