Didn't take time to check all your suggestions so far, to much, I leave that to you guys. Now you know.

Anyways, more options over all.

[options]
Window mode
Other then that there's lots of small options like sound, but not gonna go there.

Over to something a bit more interesting (and annoying). The fact that every time you play a level the same things happen all over again, like some levels trigger videos after - like when you first gain access to the world of goo corporation, shouldn't be there after you've played and finished it once.

I think it should be faster to restart a level, not like it takes for ever but when you're out hunting highscores you don't wanna wait a single sec, specially not over and over and over again as you replay it.

Other then that there's not much else I can think about right now, love the game, like all games that lets me drink coffee while playing.

You can switch into windowed mode by hitting alt+enter, the game will actually remember this setting and launch this way every time you play.

Oh, thanks, one problem solved :)