Beast97 First thing I would suggest is reducing the repeated events. Instead of adding "Bird is overlapping with top pipe and its action then Bird is overlapping with bottom pipe and its action and all. You can just add sub conditions. Check the image below.
What exactly you need from here. Its already done. Score layout is not connected that's why it is not visible. I am sorry, as I am on the run, I could not settle down with your file. so created a simple file with simple sprites.
Here I have create all the sprites, texts related to the socre or game over in new layer called game over. Click the layer and set the initial visibility to Invisible on the left. So, as the collision happen with any obstacle, set this layer visibility to Visible. It's simple. you can place your score text there.
Hope this helps...