No problem! After checking it again, it is possible to do that in most levels but for whatever reason 1-4 is just missing the pause menu. 
That would explain the confusion. Also I checked, esc doesn't seem to work either. Seems like it needs the settings button on screen to work but I'm no coder.
I will get back to you later once I have some time to try some other levels, see if any other issues show up. But I will happily follow development of the game.
Edit: Also apparently I'm blind, The numbers were there all along.... oops sorry.