So, it is a variation of Highertower.

Same old, same old.

Except,

as you go up, you progress through varying layers of the atmosphere, with signs detailing how far up you go.

Gravity gets lower and lower to a point where there is none.

There's also some background details like rockets, satellites, planes, and clouds.

The sky also changes as you go up, as the atmosphere gets lighter and lighter, and you can even see the curvature of the Earth itself.

Does it sound interesting?