Considering games through the lens of economics and how that can shed light on what makes a decision interesting (video):

https://www.youtube.com/watch?v=rLcqQmCZ2f8

An overview of the board game design process: prototyping, deciding on mechanics, finding playtesters, and more (video):

https://www.youtube.com/watch?v=P6F9yfYGWz4&t=17s

A look at action timers as a game mechanic: how they affect the play experience, games where they work well, and the kinds of players that might enjoy them (video):

https://www.youtube.com/watch?v=y8LwUeOFigY

How marrying theme and mechanics can reduce cognitive load, create a more immersive experience, lead to significant design decisions, and aid in development (video):

https://www.youtube.com/watch?v=bdGSLesysPg