There won't be further updates to itch.io version. Game is going fully commercial on Steam: http://store.steampowered.com/app/648800/Raft/
Unfortunately for Mac/Linux users, the future of Raft on those platforms is uncertain.
“Will Raft release on Mac and/or Linux?”
We are first and foremost focusing on Windows. We would like to support more platforms in the future but due to certain parts of the game making porting more difficult we cannot at this time give any promises.