The Jan Willem Nijman talk was excellent, thanks for posting it!
To those that haven't seen it yet, he iterates a boring game prototype into something that actually seems worthwhile. And all he does is add tiny things that seem inconsequential at first. Stuff like "make the bullets faster" and "add a muzzle flash".
I was amazed at how big of a difference the small changes made in the end. Adding enough lipstick to a pig actually worked wonderfully.
http://www.gamasutra.com/blogs/RyanClark/20150917/253842/Wha...
Here's Jan Willem Nijman of Vlambeer discussing a large number of small improvements that make games feel good:
https://www.youtube.com/watch?v=AJdEqssNZ-U
Here's Rami Ismail, also of Vlambeer, explaining how making a game a week helps you develop an intuition for some parts of game making:
http://ramiismail.com/2014/02/game-a-week/
Here's a talk by Sid Meier (Civilization) about Interesting Decisions:
http://www.gdcvault.com/play/1015756/Interesting