you have to press tab to switch soul, it was said in the little blue box, you were supposed to use the soul plant to activate the lever wich would have let you see the rest of the level
https://www.youtube.com/watch?v=HWicK2A2H6I
the video I made does not show the end of the level 2 you have to find out by yourself (there is also an easter egg at the end)