The underwater update is still progressing and looking better! (Work in progress)
Just an example of how it's changed
Before (This is from the last update):
After: 
View game page(Please watch in high quality)
So it was more intense and oppressive before and reused the dirt tiles. Now it's more atmospheric, enchanting and visible. I created a smoother floor tile for finer sand. There are obviously also new resources coming with this.
It's still work in progress so things can change, but it is nearing completion.
Thanks everyone!
See you soon!