Is there a set order to progressing in the game or can you do what you will, when you will - and the game advances as obstacles/ puzzlements are breached?

From the start of play it will be obvious to gamers that they can wander around wherever they like and tackle any puzzles whenever they like. This was one of the most important factors to me, I wanted the gamer to be removed from their real world by Alida's visuals, sound and music. The gameplay is non-linear, although there is a natural progression to some of the puzzles. New places are revealed when you solve puzzles ...

This just gets better and better.

I really enjoy a self directed amble around a game world.

Non-linear means possible dead-ends?

Let me get this clear:

If I solve puzzle B, then go to puzzle A for the 3rd time and then solve puzzle C; I can progress to next level?

I'm not sure what you mean mdamlady...?