Thanks for the tip. I actually had managed to find my way across that area and blocked off that lower eye, but I was stuck at how to reach the end from that point. I came back to it today though and managed to figure it out. I got to the end of the game and I have to say the end-screen is very cute.
Thanks too for the info about the fear effect. There's some really interesting stuff there I'm going to have to try out myself.