It's not Escape Velocity, but Maelstrom was open-sourced [1]!
A while ago I forked a version and changed the braking power-up to be controlled by a button press, instead of always active [2]. It was cool to fix something that always bugged me in a game I played when I was a kid.
[1] https://en.wikipedia.org/wiki/Maelstrom_(1992_video_game)#Le...