Oh wow, what an unexpected find.
(spoilers)
Not being able to go back after the game ends really adds to the feeling of the end of the world being so unexpected. It really got shocked that I couldn't go back and explore other options, in a good way. The voice acting was well done in my opinion, and learning about Ethan during that short time was enjoyable. The character design I felt was a bit lacking however. Other than that great game!