In Critial Mass (Critter) by Frank Becker your world has been infested by an aggressive army of space critters. Overrun and unprepared, your government was unable to defend its precious resources. As a last effort to recapture some of the “goodies”, you have been placed into a tiny spacecraft and sent after them. Ported to Pandora by ptitSeb.

http://repo.openpandora.org/?page=detail&app=criticalmass-ptitseb