Remember that good design is a bit subjective and, in the end it's you choose how you want your game to be.
With that said, here is my thoughts on all the level:
lvl 1 - this should not be the first level of the game
lvl 2 and 3 - ok
lvl 4 - there should be a clearer hint that the solution involve running.
lvl 5- ok
lvl 6 - there is no clue at all what the solution are, and it should be some hint/reminder that the player can run thru the wall.
lvl 7 - what?
lvl 8 - this one is really good
lvl 9 - there is no hint that you should exit with your clone.
lvl 10 - there should be a way to find the right path without trial and error.
Finely if you want to learn more about puzzle design i can recommend you to watch game maker's toolkit video about the subject: