A "space" or "return" button is needed to go on to the next level. I'd prefer to not have to use my mouse. (Or is there already one that is not as obvious as space or return? In which case, a more intuitive choice is needed.) A small thing like that makes a big difference in terms of immersion and ease of play, so focus can be on the gaming itself, not the mechanics.
MisterOh -- But you always could reread the intro. It's there on the level menu, a little envelope on the bottom. Click it anytime to watch/read the intro. ;)
@tofout:
If you google walkthrough for William and Sly 2, you'll find your answer to that. A lot of players see something frozen and think "Ooo, pixie!" It's playfully deceptive!
@Kajenx: I hope you don't go changing those things to make it easier and more straight-forward. A little trickiness for the fox gives a little challenge and adds to the fun. ;-)
 "Tricky Rick"){kind=icon}
 "Memohuntress"){kind=icon}
 "All That Matters"){kind=icon}
 "William and Sly 2"){kind=icon}
the "space" button added to go on to the next level.