Recreate this in Tyflow?

[Domokun]

I had a quick look...
Overall, you did a good job...

But first of all, your gravity is positive, so once they are moved by speed, the just are further pushed by gravity up. Use negative values for gravity, so they fall down.
Secondly, your units setup is set that it display in meters...  Go to units, set display to CM, so you don't have to type in 0,0001 for speed (in meters)... but more like 0,1 or 1 (in cm).
So, your system basically works, it's just, the values are too strong... speed is too strong, and then your gravity further pushes them up.
Again, my suggestion is that you switch to cm display units, and play with values with speed, and negative values with gravity.

Also, if you want to trigger more particles with surface test operator (right now, only few are triggered), set "rgb greater then" to lover value... I think 80 is a good number.

Hope this helps.

Excellent! Thank you so much! Trying now.

Here is my "final" version. There are some issues but I'll take another pass at some point. Issues:
There are sections where whole dots rise evenly
sometimes connecting lines disappear

Thank you so much for your help. I'll post the next "challenge "soon as I stumble upon it.