You're not the only one.
I think this is a good idea. Same for Thief Gold demo.
Difficult it's not, even the finale, all ghostable save maybe for one problematic spot (but still doable-buggy?) (and one scripted scene where you take damage no matter what) . In other regards I conditionally agree, some bugs but the atmosphere is pleasantly and surprisingly intense even if it tries hard to. Could have inspired some DrK's hellish sections.