vector-based rock-shooting

 "Vectoroids" is a vector-based rock-shooting game similar to the
 arcade classic "Asteroids."
 Pilot a spaceship and destroy asteroids by shooting them into smaller and
 smaller pieces while trying to avoid being smashed or shot by UFOs.
 .
 "Vectoroids" is an SDL game based on the source for
 "Agendaroids," an X-Window game written for the Agenda VR3 Linux-based PDA
 written by the same author.