+ Most importantly, the quality of puzzle design is still great. While minor gripes could be thrown at the rollercoaster level of difficulty when moving between areas, for the most part it really hits the sweet spot of making your brain work while rarely being frustrating.
+ Regardless of quality, an escalation in scale that could be compared to the giant leap between the two Portal games – the way the game has evolved from the original in so many ways is truly notable.
+ Absolutely stunning graphics and world design that make arriving in each new area a real joy.
+ An engaging story with interesting characters, strong dialogue and pretty great voice acting.

- Swaps out the more open-ended philosophical nature of the first for more of a mystery-style adventure which some fans of the first game might not like.
- The massive scale can get a little bit tedious towards the end when you are sprinting around for minutes at a time trying to cross off the last few puzzles.