I think that he second level is very easy once you get the timing. However the first one involve a lot of milimetrical jumps and movements on the air.
I have unlocked the kid at the end. The first level was the hardest imho. After unlocking the kid I have repeated all the levels twice and only took me 10 and 5 minutes.I had the most problems with the second. Also I got the guy, and i use him all the time!