I think the water looks really nice. But, it's more than just a visual effect. When you jump in the water, your movement speed is cut in half, but you can jump higher. My origional idea was to have Blocky Man swim in water, but I decided against it. The fact that I have this working also means I have tile layers working.
Next, I'll probably move on to do more special tiles, such as ladders. Personally, the thought of programming ladders makes me cringe, just as programming platforms for Stompy's Revenge did. But, it's important to the game, so I have to do it.