This game is an interactive adventure that encourages the player to discover, and seek natural joy from the simple act of walking around and observing the game environment. Games that nail this concept are Journey, and Limbo. Both do not involve combat of any kind, which is different to games today as most are too caught up in pleasing the general basis of customers than exploring creative ways to produce new gameplay that independent developers seem to do so well.
The game follows a bird like creature who flies throughout a huge skyline filled with other flying creatures and puzzles. The aim is to explore flying ruins in the sky, except the objects have gravity of their own as the space that the player flies around in outside of these areas is actually similar to deep space itself as they merely glide through the free space. This idea is reflective of the idea of space travel between planets, only expressed in a different and more familiar way (such as the simple wonder of flying as a bird, a feat man will never physically accomplish).
Inside the flying ruins, the player must explore to unlock new areas and relics that boost stamina so the player may fly for a longer time without draining and eventually falling from the sky as they can't make it to the next ruin. There are objects in the sky that allow recharge of the player's flight however as the goal is to generally never lose a life in the playthrough. Upon each loss of life, the player is sent back to the stage they were at prior, this is again to reenforce the easy going nature on the player as this is meant to be more of a gentle playstyle game.
The colors are saturated and vibrant, the sky will be the most beautiful part of the game asides from the immense details in the player character itself as alot of time will be put into the flight animations and 3D model to represent a physical display of elegance itself.
Here is an image representing the idea behind the player's bird/alien creature