Potential bug, I died after breaking a couple of the crystals and they regenerated, but now it seems the ones I broke are invulnerable? Went through my whole clip on one and it still didn't break... Love the game overall though!!
I'm having the same problem, the girl is over to the left of the green box so she should transition to the connected hallway, but no matter how long I hold left, she doesn't move. Hope the screenshot helps :)
Such a fun game!!! It took me longer than I'd like to admit to find the right path to the 3rd (hopefully last?) secret room but I thoroughly enjoyed every minute of it!