Ahhh, your game reminds me of Maelstrom -- even though all the sprites were prerendered, the sprites were rendered in 3D and I spent so many hours on it...
Oh man. I spent so many hours playing Maelstrom on my LC 475.. Through your wiki link I discovered that Ambrosia open sourced the game - there are even OSX binaries. https://www.libsdl.org/projects/Maelstrom/binary.html
Nice! That looks like fun. I'd really like to do a more complete asteroids remake and put proper time/thought into the design + aesthetic—it's one of my favorite games strictly for gameplay.