Nicely done!
I'm sorry I didn't get in time to give it a rating, but I had fun with it :D.
I noticed that the water changes material midway at times, not sure why that is. It makes all of the water brighter at once, then after a bit darker, and so on. It's a bit distracting until you realize what's going on.
Some music, and especially, some sound effects, like footsteps, landing, and a jump chime (ala Mario) would give it a lot of "life".
Cheers, and congrats for the release!