Hey @ExuberantPenne, @Madi_Hopscotch_'s suggestion of changing the Change X by 1000 to Change X by -1000 should help, if it doesn't then let us know!
And also, just in case you've missed it, in your Fall ability for Bird (your second screenshot), make sure you drag out the Up down value into the blank of the Increase Value block.
Here I replicated the original code (the space in the black box that's marked in the picture is what I'm talking about):
And here, make sure you drag the Up down value inside:
And yes good luck on your game too!