The links to the builds are up on the Steam page:
Steamcommunity.com
Please read the README file before playing the game, it contains important information about controls,etc (I don't have a tutorial yet).
You can leave feedback preferable on the dedicated thread on the Steam Greenlight Concepts page:
Steamcommunity.com
Alternatively, there is also the official Facebook page for the game, but try using the Steam page if you can :)
Facebook.com
Forgot to post this here, the Steam Greenlight Concepts page is up! Go visit the page for tons of info and design discussions!
Update on what happened at GDC relating to the game (also need Unity Pro trial extension!)
Featured Frequency Domain in Indie Spotted. Wish I was an octopus so I could play this all day.