I remember a pack of Windows games that had a game like this in it. That was almost 10 years ago. It's a good game.
I also recall one that was similar in which you would try to get the ball(s) into smaller and smaller sections. In that way it was like QIX, but it actually was similar to this Boletes game. You would move to a place on the screen and then hit the button. Your wall would extend from there up/down (or left/right) until it hit both walls. If the ball hit it while building, you lost, but if the wall got completed then you could continue.
I don't recall the details of these games too well, but I do remember wasting a fair ammount of time on them. I also think that there was the cat/mouse game in there where you would control the mouse and try to box in the cats. When you trapped them, they turned into cheese. Someone made a GP32 version of that one a long time ago.
Anyway, cool game. I'll be waiting for the GP2X version.