It's a very simple action game.

Just walk without stepping on the line.You can walk by clicking or pressing Up arrow key.
The time limit is randomly from 15 seconds to one minute. Extend the record as long as possible.
Once the walking distance per meter the earth will be saved (it is supposed to be). Even if the earth is safely saved, you will not get items or proceed to the next level. Even so, you should be happy that the earth was saved anyway.
If you step on the line, the distance is invalid and it will not be recorded. And the Earth will be destroyed once (it is supposed to be).

"If you can walk without stepping on the line,the Earth will be saved!"
https://motquu.itch.io/earth-will-be-saved

Enjoy!