I just finished the game and here is my very short review:
Interesting concept (despite knowing Hitler was not assassinated), poorly executed.
The English language version the characters don't even attempt a German accent. Most don't' even attempt acting. They're just reading their lines.
They game consists mostly in running around talking to people. You do have to win a game of cards. And one annoying dodge the spot light sequence. I never like these puzzles because the characters always stop moving when the light is a few pixels away when if they kept moving they wouldn't have gotten caught. And you have to do it twice. When you fail the sequence starts over so no having to reload a saved game. Except its easier to reload a saved game from the mid point than do it all over again.
I only finished because I don't like quoiting and I wanted to see how a game to assassinate Hitler, which didn't happened would end.
The game end with "To Be Continued" which apparently it does in A Stroke of Fate: Operation Bunker.
Adventure Game: Broken Age
Darkside: Star Wars: The Old Republic