What did you learn?
I learned a lot, not just about shaders. I'll probably take a few days break and then do a water simulation in Unity.

How did you improve the terrain?
The project started out as a terrain generator, but in the end I didn't do much generating and made a game :D Although I did try to use a lot of noise for effects in the game, so atleast that's something :D If my submission is ineligible because of that, I'm okay with that, I'm just glad I had fun and some people will play my game :)