I finished the game. I'll post my stats, though I'm not happy with them.
Playtime approx 14 Hours
Secret Rooms 13/16
Quests Completed 7/8
Money found in lost purses 437/437
Exp gained through exploration 1620/1900
Chests found 50/55
Safe Deposit Boxes 1/2
Total Score 450
Excellent exploration skills. You can be trusted to lead any party.
Rick personally defeated 250 enemies, 541 Prowess Points
Anna personally defeated 104 enemies, 148 Prowess Points
Sebastian personally defeated 184 enemies, 458 Prowess Points
Henry personally defeated 56 enemies, 87 Prowess Points
Bella personally defeated 80 enemies, 168 Prowess Points
The first 12 secret rooms were fairly easy to detect, as was #14. I never found #13, #15, #16, so I'm definitely going back to an earlier save and try to find those. I think there must be an entire area I somehow missed that would account for those missing secret rooms, chests and the second safe deposit box.
I'm so glad I bought this game. I loved the characters, the story, the dialogue (which often had me chuckling out loud), and the battles.
Going back to find those secret rooms now....
Edit - I just now found #15 and #16. They are definitely as obvious as the others. I shouldn't have missed them the first time.
Edit2 - Finally found #13, so now I have them all.
Bug-Twilight Scroll. Use it on Anna or Bella and they will learn the spell. Use it on Henry and the scroll is consumed, but Henry doesn't learn the spell.