Since Khushal64n6 already finished levels 1-5 (and yaqxsw already showed levels 1-4), I tried levels 6 and up.
Level 6: I don't know how to pass the row of loose tiles at the beginning.
Level 7: I don't know how to do the trick at the very beginning (trick 36 doesn't work because the gate closes).
Level 8: I don't know how to do the trick at the start of room 6.
Level 9: On the air platforms, I think I need to do trick
42, but that's too difficult for me. (It took me a lot time to record it for the trick video on popot.org.

)
Level 10: This is just too difficult for me.
Level 11: I can pass the second gate, but then it gets too difficult for me.
Level 12a: I can get about halfway down all the loose tiles and then fall to my death.
Level 12b (13): It's interesting that pressing right (and Shift) during the start moves the prince further forward. I can get to the right side of the first chomper, but no further.
Princess: I die on the right side (the loose tiles) at the start of the level.