i've played this game for a little bit and thought of a few things ya could add...
Sharks: a clear reason as to why they would attack the raft(like dont make to much noise), maybe more appearing at night and less to none during the day.
A bed would be a good way to get through the night especially since I feel like my character would sleep during the night anyway.
maybe something to store clean water in.
something that i can craft to stop the shark from attacking certain part of my raft (like spikes made from scrap metal).
these are just some of the thing that i thought about... I'll let ya'll know if i think of more...
But good game so far, i cant wait to see where this goes!