They should've called it Runaway II: The Dream Of The Turtle: Act I
The gameplay is mostly just right, there were a couple of places where you need to stretch you sanity to think of the right thing to do. But all in all it's common sense, just imagine you're in the situation and you'll figure it out.
The story gets more sci-fi-ish than the first one, you also get to see some of the old friends and get filled in on what happened after the first unforgettable adventure :)
There's one HUGE (in my humble opinion) drawback... just as you get to the most interesting part!!! It ends! A cliffhanger, in other words.
It's a really good game nonetheless, but I'd suggest you wait till the third one comes out and then play both in a row.