Hi, thanks again for checking it out!
I don't have a browser version since the UI breaks unless it's full screen, I'm new to Unity. ..been trying to fix that for a while!
For level 4, I just added the turn around block so that so people know that both walls and that block can be used to turn around. But yeah you don't need to use it.
Did you end up using the Hint icon (the light bulb)? It shows a suggested placement of blocks to finish the level if you get stuck.