InnerSpace is an exploration flying game currently in development for PC, Mac, Linux, PS4, Xbox One, and Switch. Set in a world where physics are inverted, explore a setting of interconnected, inside-out planets. Piloting an agile aircraft, take the role of The Cartographer and explore the various bubble-worlds, collect relics, and encounter each bubble’s resident demigod- all in order to discover more about the universe, its history, and its future.
This is an older screenshot from an unpopulated area of the environment. While the level of detail has been tweaked significantly since then, what's cool about this image is how the visual effect of flying within a sphere is apparent. Notice how the terrain in the distance almost looks vertical. It's not a wall, but instead, the ground curving along the planetoid's circumference.