Download of Astronut 1.1.1 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.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free software for Mac OS X is an intellectual property of The Iconfactory. The program is included in Games.
From the developer:
Astronut is a game application that lets you explore uncharted galaxies. You will blast off on a planet-hopping adventure of cosmic proportions. You need to gather star shards and avoid unfriendly life forms, all on your quest to explore the universe and become the ultimate hero.
You may want to check out more Mac applications, such as Jets'n'Guns, Rubicon X or Marathon Red, which might be related to Astronut.