Problem with falling objects that you have to avoid

I need your help. I am new to MIT App Inventor and have no experience. I want to create a game in which a character (an image sprite) has to avoid falling objects (image sprites). I'm having trouble making the objects fall smoothly and vertically straight down. I would like to include a score, which I think I can do on my own.

Thank you so much for your help!

So how du you do it now?
Do you use a clock timer and change the ObjectSprites Y?

Or do you set the speed and bearing of the falling sprites ?

Also, how do you nudge the sprite X value as it's falling?

Button clicking?

Dragging?

BTW, the canvas y starts at 0 at the top and increases downward

A simple example:

fallingObject.aia (4.6 KB)

http://www.appinventor.org/book2

See chapters on animated apps.