TSI should be PWYW as well at https://half-apress.itch.io/this-space-intentionally until the next release.
In general:
1. If I reorganise the bundle order I make any game removed from the bundle PWYW for 3-6 months.*
2. All PWYW releases convert to a purchase of the book when it goes full price.
* There’s one exception where I gifted everyone who bought at a specific price tier the book that had its order in the bundle changed.