Here is a hint:
Leave your cursor between the goals you want to score on (slightly below center) - this way you only need to worry about player movement direction.
You get 10,000 points just for playing. Each goal you score is +1,100, while each goal you allow is -1,000
You can score about once every 7 seconds. However, the game seems to learn (after the 9th or 10th goal and WILL score if you have at least 90 seconds left and 10+ goals)