A few options to consider for the future from reviewing the original film (see https://www.youtube.com/watch?v=MvEXkd3O2ow starting at 00:25-)

1. Not all rain columns have cursors
2. Not all rain columns always fall vertically- some columns stick and fade in/out
3. Some rain columns have cursors that dont fall the entire lenght of the column, they blink in and out on the way down the screen
4. Some rain columns have cursors that jump to adjacent columns laterally rapidly creating a random wiggle effect

Some of these options are seen at https://www.youtube.com/watch?v=0xbi3U6G7iA

Great job on this!