Here's a few tips.
Try to complete combinations (see image below)
The pink completes 1 vertical line
The yellow completes 1 vertical and 1 diagonal line
The yellow squares disappear and the red square falls to complete 1 horizontal line.
Rotate the squares fast and position them, then pull the joystick down.
If you have one line left to end a round and get a combination, you will have fewer lines to complete the next round.
The game actually ends after 491 lines. Because of a combination, my high score is 492. I will not be competing in this competition. Have fun!