Onefog Xonix

Description
Onefog Xonix is original realization of a well-known arcade QIX.
It is played in a 2-dimensional arena, in which Enemy-balls bounce around. The Player controls a ball, which may move both around of sides of this arena and inside it, leaving a trace behind.
When the Player's ball reaches edge of arena, area inside a rectangular, which does not contain Enemy-balls, is filled in.
If any Enemy-balls hits the player or player's trail, the player loses a life.
The objective is to cover some percents of the arena in order to reach the next level. You'll just have to play it and see...