Did you not get the tutorial hint at the start of the level? E to explode, Q to cry (although LMB also worked for explode), when you run out of health you should have dropped back down to a lower level where there were pickups to recover health and energy. There was a bug during my dev build where when your health dropped to 0 it went back up to 5 or 10 but didn't trigger the level drop but I thought that I fixed that
Oh, sorry I must have missed the hint at the beginning of the level. Maybe you could add the controls below the game just in case.
I did drop to other levels and collected stuff but I kept doing the same things and going back to the anger stage and dying so in the end I stopped trying :)
I will play it again since now I know how to beat them :)