Pretty simple. But very fluid. No slow down or blockiness.
The hero (you), does a nice little tip of his hat whenever you get through the level.
Not a lot really. People call for help, and thank you when you've rescued them.
A good tutorial through the first levels, and loads to get stuck into. This game will last you some time. But it's a game that you need to have, and take time with. As sometimes it takes a while to work out where to go and what to do.
My main gripe with the game is that sometimes he doesn't do what you want, and the tutorial messages are quite brief. So you can get things wrong.
For a cheap price worth a look