Refactoring in OOP style (C#)

[the-Dust]

This is my view on how Hangman game can be realized.
I tried to stick to concept of elegant objects:

• Small, mostly immutable classes with no logic in constructors and no private methods
• No inheritance, only interface implementation
• No parameterless constructors
• Behavior variability in general achieved by polymorphism, not by if/else operators