Sorry, that's an error from my side - I had some problems as it is my first upload here. The first one couldn't even be downloaded :) I'll fix that one!
EDIT: Aaaand Linux version should be available to download now :)
One thing you really should be adding would be some indication of speed. Maybe having some debris floating on the water, or some waves one way or another. If a real water shader is too complicated, just a sprite or two would do already.
Thanks :) I am already working on debris, and the water. I have been learning how shaders work, so hopefully the water will get a nice effect. The speed indicator is new, I like the idea and will look into it :)