I know this is an older thread, but I did not feel the need to start a new one.
This is the hardest game ever. IWBTG... any doubts?
Just play the demo!!!
http://kayin.pyoko.org/iwbtg/downloads.php
There are quite a few youtube videos of people perfecting some of these lvls. Check it out. This is just one of them.
http://www.youtube.com/watch?v=F_C5KZ0E8YM