I love the variation on the fly wings. I got lost in a couple ways during my play through - one thing I'd love is if maybe there was a marker on the edge of the screen always showing you back to your frog house, and the other was what I was supposed to do in the x/8 stage. Some text appeared on screen briefly with a yellow waypoint indicator, but they both vanished quickly and nothing happened when I kept pushing flies into my house (eventually getting to 13/8). I wandered in the direction that I thought I remembered the yellow indicator pointed at, but never found anything.
Oh, and I love the way the camera pulls out with each eye - that's a really neat idea.