I began editing my Starfield cart to remove the parts that aren't necessary and fix a couple things. So here's a few cartridges that you can modify and drop into your own programs, as well as a tweet length (exactly 280 characters!) starfield cart.
Edit: moved this to code snippets where it belongs.
Starfield Snippet: this cart is medium size, including more rendering code so you can do things like modify the position of the camera and including the function that allows the user to change the speed of the stars. Also fixes a color bug in the original and adds a new dark blue transition color as suggested by @Liquidream.
Multicolor Starfield Snippet: Starfield Snippet, but with a colorful effect inspired by the 70s warp effect in Star Trek: The Motion Picture.
Mini Starfield Snippet: this cart is smaller, removes unnecessary stuff, and streamlines the rendering, meaning you can't as easily change the position of the camera, the controls are gone, and the color transitions are removed. Instead you can write your own code to handle these functions how you like.
Tweet Starfield: a tweet-length starfield. Took a little bit of time to get it down to this many characters, and I don't think I can make it any smaller, though I'd like to see what others can do. Missing color effects and controls, and the star streaks are only as large as the distance the stars travel, but it's the real deal.
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