Add an invisible sprite to your game at the horizontal centre of the screen, and give it the bullet behaviour pointing upwards (so set initial angle at 270 degrees), set acceleration to zero and speed to whatever you want. Then in the event sheet, make an "Every tick" condition and the System action "ScrollTo (that sprite)". You can then enable/disable the bullet behaviour to start/stop scrolling, and adjust the speed as you like. Hope that helps!
I aded the evrytick system event and added the object which goes up, and it really goes up but the screen stays the same.
In addition, I have no idea how to spawn the blocks like in the icy tower game
Hope someone can help