Just thought I would note down some issues here that I have noticed. Albeit they are not catastrophic problems but mainly visual ones.
1) When above the water it seems to be very pixelated/blocky
2) When looking to the horizon there is significant amount of shimmering (which looks like antialiasing is either not working or not available)
3) When under the water and looking up there appears to be no transparency, it is purely black. I would expect some blurriness at least
Below are a few optional things that would make Outerra feel a little more natural. Of course, i'm unsure how much work would be needed to apply these so take them as a grain of salt if too much effort would be required as i'm sure they will make their way into the engine ast some point.
One other thing is that it would be good to have graphical settings, for example, Low, Medium, High, Extreme, for those who don't understand the available settings. You could preset these to relevant values.
option: Add an underwater sound effect as opposed to the wave breaking when under water
option: Add a sound of a light see breeze when around water or use the sound used when on the himalayas and incorporate it into the beach sound or even forest.
Cheers,
Kelvin