the game is improved
- The goal of the game: the green square must remain as long as possible in the rectangle delimited by the white lines without touching them.
- You cannot press up, down, up in a row; you can do up down then you have to press left or right to be able to press it again or down or up if you have done right, left, right. It is the same for: right, left, right and left, right, left down, up, down.
- The speed of the green square increases over time, so it is more and more difficult to keep it in the rectangle bounded by the white lines.
