How to make a block move only up and down

Help Requests
1

Im trying to make a block move up and down on my level but it just moves on the x axis back and forth https://flowlab.io/game/play/818307 here is my game if you can find any errors

2

you have to switch the properties go up instead of right in forward. remove the always to the position. make it so it is toggle instead of flip on the flip. and make a delay in the collision.

3

thank you