Hello everyone. I am confused regarding whether I am playing the right game or not. Because, the game from this site has different properties compared to that I saw on YouTube. The water was light blue, the shark was light in colour, the foundations were different, there were more than the three resources (scraps, planks and thatch) and there were many buildings like storage box, paddle etc. Kindly ensure me whether I am playing the right game or not or if it is a different version. Thank You. 

This is the old version of the game. To play what you see on YouTube, you have to buy the game on Steam.

As SkyyWasTaken above said, this is an old prototype of Raft. You can find the far more developed Steam version here:

https://store.steampowered.com/app/648800/Raft/