I'd also like to add that, while the level felt quite large in my first playthrough with slow exploration, it is in reality quite compact enough that retrying from the start to get the special objectives was not a pain at all (Edit: ate my words. For stealth not a pain, for trying combat with hand to hand only, very difficult and it became a pain xD). I find it hard to resist save scumming and think games like this are more enjoyable when you have to adapt to your mistakes and finish a chunk (level) in one sitting. Filcher and Cruelty Squad come to mind. Still, I know a lot of people are highly opposed to this, as well as other limited saving (like save spots).