The listing, Interstellar Marines - Steam Key has ended.
Interstellar Marines - Steam Key
http://store.steampowered.com/app/236370/
Interstellar Marines
Frontliner Edition is an Early Access exclusive. Your Purchase includes:
Early Access – be part of the development of Interstellar Marines and provide your feedback and suggestions as we expand the game update after update.
Frontliner identity - An early access exclusive profile on our site and in Interstellar Marines.*
Upgradable - No need to re-buy, you can own Spearhead Edition with a simple upgrade.
All In – receive all future updates and expansions completely free of charge.