You may have missed a key behind a walkthrough wall. Look at the statues on the walls - the wall you can walk through has something different about it.
Finished level 8, but look there is more! I have died an embarrassing amount of times (over 100) I have played an embarrassing amount of hours but if you ask me any questions I would be lost to answer there is so much in this game to remember. Just barely doing it myself. Quite an extensive game



