It is a cool book. I don't recall seeing a pulp with color illos before. It really does have the look of a comic/pulp hybrid.
It's more like the adult pulp equivalent of a big little book. Not that that's a bad thing.
Not in theory, but unfortunately the writing is not much above the level of a kid's big little book. Ultimately, the fact that it was a hybrid experiment may be why it failed. Newspaper reprint comic books were taking off by late 36 and this featured one of the most popular strip characters in his own book, several years before FB 25 and FC 10. But on the one hand, it had too little art and too much text to be a successful comic book, and on the other, the writing was too poor and childish to appeal to the SF pulp fans (who had gotten pretty discriminating by then).
There is an interior ad for the second one in the series, Flash Gordon and the Sun Men of Saturn, but it was apparently never released.