It's Outer Wall from Cave Story! I noticed there were a few in the vault that were created a while back in 2D forms. I wanted a 3D version of this stage so I decided to create it myself. It's got a full animating background, as well as the appearance of the Outer Wall. I also borrowed animations of the characters from A Bloody Canadian's version so we have characters and enemies appearing in the background while we brawl in this beautiful night. Credits to A Bloody Canadian for the character and enemy animations!

The stage comes in both a Normal and Omega form.

There's also a README included within the zip folder to help you around. Please report if there are any issues you encounter when playing the stage.