There is not going to be further updates to itch.io version of Raft as the developers are going to release it (upgraded, improved and expanded) on Steam's Early Access on 23rd of May 2018 with price of 19.99$.
I bought the steam Version of Raft, and the only thing i have a problem with is the FPS on single and Multiplayer. Soon as i get to an Island it drops from 30 or 40 FPS down to 3 to 7 FPS. on both game modes. I hope this gets fixed. And the weird thing is it only started happening about a week ago. around the end of May to the beginning of June.