Thanks!  You are totally right - the gameplay was pretty lackluster, especially in the ocean.  The waves are a vertex shader but then I had to duplicate the code that made the waves (just a load of sin and cos waves combined to stop them looking too repetitive) in gameplay code so the objects could look like they floated.  I totally ran out of time because I think I got too ambitious - it’s my first game jam and I am a stay at home mum with two kids - I had to bribe their dad to take them out on Saturday so I could get some time to finish it off!