I've been meaning to read book 5 for a while, I guess seeing it again here is the sign I needed. I'll finally add it to the list, thanks for sharing :)

While it probably needs an updated version, Game Design: Theory and Practice, by Richard Rouse III had some interesting stuff that made it worth the read for me, as he uses his own games as examples and gives insight on why he did or didn't do things. It also includes some cool interviews to industry legends, which were probably my favorite parts.

I found 100 Principles of Game Design, by Wendy Despain to have some similarities to Jesse Schell's, but in a more compact/summarized way. It's probably good if you don't have much spare time.

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And while not strictly Game Design, I think every aspiring Game Designer should read Story Engineering, by Larry Brooks. Book drags on a bit at the beginning, but once it gets to it, the author really breaks down how stories should be structured in a very easy way. It's meant for writing/writers, but seeing how messy/confusing/cliché/poor many video game stories are, I consider it a must read for Game Designers as well.