The program file name
"Xonix" game. KolibriOS 0.7.7.0 distribution contains it.
Aim and rules of the game
About the rules of this game read here: 
To start a new game press "1" key
You can change game field size before game start using buttons in the lower part of the game's menu window.
The direction of the cursor movement can be changed using the arrow keys
To pause the game press "Space"
If your score will go in the top ten, after the message "Game Over", then type your name in the "Best results" window and press "Enter". To return to the menu, press "Esc"