Your solution to level 3 - Bombing Run is a definite backroute. Putting that second blocker in that position is unintended, and collecting the pickups in that manner is also unintended, so it looks like this level requires a little tweaking. I do admire your perseverance when it comes to solving levels, though.
Level 6 - The Crypt also has a sneaky solution. Building over the trap like that is not supposed to be possible!
Looks like I'll have to think of something...
Level 9 - Uneasy Alliance. Once again, some sneaky usages of the fencer skill.