This is a really incredible game, I see badges coming real real soon.
One thing I noticed was the game doesn't autosave, which can really get on my nerves when I accidentally exit by habit.5/5.
I love killing with the arrow gun since it stays on them and I can look at them with arrows in their dead bodies and feel accomplished, like a trophy... and making a 'Gas shield' with 3 of those things in front of me and saying "You can't touch me!"
The grenade dart is by far the easiest and best weapon to use...