v2.2:
1. Pause of game proccess.
2. Possibility of speed Up by holding the arrows.
3. Snake has a head.
4. The target is an apple.
5. Complete progress bar (%).

v2.3:
1. Saving progress when exiting and loading it when starting the game.
2. Endless mode switch (If turned ON -> the game continues even if the snake collides with the tail or the frame, so the player gets a chance to win the game).
3. Game timer.
4. Breaking by holding the back-direction arrow.
5. Brand-new system of the next random fruit positioning (it fixed the major bug when the fruit appeared in the left-upper corner of a screen despite the fact that the field (0,0) is already taken by the snake's body).