Had a quick go at Brickout B6, new backroute this time.
Yikes! That one was a big problem.
When I originally designed the level I think I had been assuming that the cube will completely seal up a basher tunnel, but I forgot that the basher tunnel is actually slightly taller than the cube. And actually I guess that is a somewhat moot point anyway, as there are other places that cube could go that would serve the same effect.
After some consideration, I currently settled on this change seen in B7 to fix the backroute. It's once again not very brick-ish, but the few other alternatives I came up with so far feel too drastic to me at this point (at least until some other backroute forces my hand yet again; we'll see).
[edit: sorry, that didn't quite work as intended, due to an asymmetry in the behavior between left- and right- facing Lixes in the setup. Will post an update within 20 minutes]
[edit: B7.1 posted here. Darn it, now it looks uglier than ever
]
[edit: too easy?
Check out
B8 then]