This package is an Atom Editor syntax theme which attempts to render as closely as possible to the way the Twilight theme actually renders on the TextMate 2 Beta.
In particular, various colors in this theme are not copied directly from Twilight.tmTheme because TextMate 2 (or OS X) renders them as lighter than they should be numerically. For example, the background is specified as
#181818 in Twilight.tmTheme, but color sampling the rendering on-screen yields
Not all the colors have been re-sampled, it is a work in progress.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.