Astro's Playroom is a WONDERFUL pack-in system demo. Maybe the best of all time, in my opinion. Nintendo has included Mario games in the past, but this isn't really a full fledged game, it's more a tech demo and a controller showcase for their new Dual Sense.
However, it's exceptional. The game play is great, the mechanics are all wildly fun, and it's not super easy. It's a simple game all ages can play. I was playing it today again with my six-year-old daughter, and I'm not sure which of us had more fun?
I also firmly believe Astro could become a GREAT mascot for Sony, as far as making a series of priced games featuring the character. I know I'd drop $40 on a sequel for me to play with my kid.