I can't say enough good things about Outerra... it is amazing what you have accomplished here!
But if I had to wish for one thing that doesn't exist yet in the world of Outerra, it would be:
realistic waterfalls / cascades, with boulders in and around the water.
I understand that development requires you to prioritize what gets worked on actively, and what gets put aside as possible future goals. I'm content to share my thoughts and let it wait until there is time for it. But...
wouldn't waterfalls in Outerra be spectacular? Imagine a rock overhang with waterfall projecting far enough outward that Andfly's eagle can fly between the water and the rocks!
(That scene should be in your video demo when the game goes public. )