Here is a list of other bloggers that I find interesting:
Jorgegv has create the rage1 engine (Retro Adventure Game Engine) written with Z88dk and assembly. It’s top notch and
https://github.com/jorgegv/rage1
He also has a list of Z88dk Optimizations that is a really good read.
https://github.com/jorgegv/rage1/blob/master/doc/OPTIMIZATIONS.md#code-size-optimization-guidelines
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Robin is a prolific programmer and works mainly in assembly code, his Blog is top notch. Currently he is working on a games for the ZX Spectrum Next machine. It’s well worth a read.
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Allan works with and programs and maintains the AGD game engine. He has added additional features to AGD that has really improved the overall package with brilliant ideas. He’s worked pretty hard to improve AGD. Give it a read.
Coding Adventures with the ZX Spectrum 