Very nice and fun game! I'm impressed that it's procedurally generated, I really like when people put that in jam games, because it's more complex than just making some levels. The artstyle and music also fits really good. I think you could maybe add some in-game controls info, because I had to take a while to figure out how to use them.
Our games are kinda similar, I also have a stage where you fight off sharks with a spear and I also have a similar low poly graphics, but I think you did a better job :D