Download of Spinvaders 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The bundle id for this app is com.rebisoft.spinvaders. The program lies within Games, more precisely Arcade.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac application is an intellectual property of Rebisoft Inc. The following version: 1.0 is the most frequently downloaded one by the program users.
From the developer:
Spinvaders thrusts you into an endless space battle against a range of deadly and ceaselessly persistent robotic spinning droid ships.
You must scan your surroundings for vital abandoned fuel pods and travel through wormholes in the very fabric of spacetime to discover multiple parallel universes.
Beware though, the spinvaders will follow you through the blackholes!
You may want to check out more software for Mac, such as Alex4, MicroWar or Bubblegym, which might be similar to Spinvaders.