I love looking back at old reviews and seeing people convinced something is optimal 10+ steps over the current solution. Makes me laugh.
The only solves on this level currently are the trifecta + the record holder. Hidden GM?
For me, the route felt forced all the way long. I never had to make a choice because either only one room was opened, or the block was unambiguous and could be used at one unique location.
Only the upper left corner and the arrival to target allows for some optimization.
Real great concept, worth to start a serie, I agree.
The picture is good and the hole-filling is fun, but it feels like the start and exit locations could have been chosen more carefully to avoid a double solution...