Yeah, I think I messed up doing the whole puzzle aspect. You're supposed to craft a raft & paddle to get across. Thank you for pointing it out, I'll try to put up a fixed build soon where it's easier to understand.
Honestly, I know that you needed to mix genres for the game jam, but, after the jam is over, I think you should get rid of the puzzle aspect, and continue the game as a survival game. I feel like you can really get somewhere with it, and maybe one day you could have it published on Steam - especially with the amount of work you did in 48 hours. I'll be checking this game once and awhile for updates. Keep on working, and good luck!