I tried to post a screenshot, but I got an error saying "post: body: expected text between 1 and 20480 characters." The score in the screenshot was 52 points, lasting 32 seconds.
I had a game that went slightly longer, with a score of 57; I think the time was 37 seconds. I notice, when the game last that long, that the stars in the background scroll by in a repetitive manner, separating out into discrete lines.
This doesn't seem to me to be a very good score, but it seems like success is partly luck, in not getting a configuration of rocks that herds you inescapably into the corner.