How does your submission match the theme?
First of all, and most importantly, the movement meets the theme in the following way:
The characters leave a trail wherever they go, which influences their movement similar to a stream. This makes it possible for the players to achieve higher velocities, to reach the other hemisphere and the orbs they are trying to collect.
Besides this, the trails make it possible to defend the orbs in one's own area. They can either use their trail to move the orbs further away from the other player, or use their influence to let him drift in an unwanted direction.
One can argue that the menu also serves two purposes.
It obviously lets the player navigate to certain parts of the application, but it also acts as a narrative layer which gives insight about what might go on in the world of “A Tale of Wind and Sea”.

Third-party resources
Unity 2017 (Personal), Adobe Photoshop CS6 (Student Licence), Adobe Illustrator CS6 (Student Licence), Cubase Elements 8 (Bought), Audacity 2.1.2 (free), Rewired (Bought Assetstore Unity)

Contributors
Leif-Eric Nordmann
Justin Zwack
Matthias Fath
Tobias Bruch