@hrast I did. It has some shortcomings compared to The Dark Project, but it has a lot going for it too.
The 1920/30s setting feels really fitting for the same kind of noir atmosphere that Thief had, and the transposition of Greedy Lords and Corrupt Priests with Vain Socialites and Crooked Businessmen works tonally and thematically.
In terms of mechanics, it adds some new twists on the Thief tools, and adds a running-slide mechanic for quickly getting across visible areas and back into hiding. However, it lacks the vault/mantle mechanics, so there are some silly situations where a waist high barrier forces you to take the long way around when climbing it would have made more sense.
On the whole, I'd say anything who likes Thief or Immersive Sims in general, Filcher will be up their alley.