I hate to disagree with first reviewer, but I don't think it is so bad they wrote. Curious enough, the main point of that review is seemingly horrible layout of the book, but I didn't see anything like that there. I'm not saying that layout is great, because it is the weakest point of the product, but it can be ignored, especially when you're not a typography geek, but gamer who look for something to play.
Unfortunately, I'm both, so I can't say that book is laid out perfectly, personally I think that for such a short and compact set of rules, one-column layout, like that used i Fate Accelerated would be much better. I also prefer that sort of rules presentation - with "meat" put in main text and some explanation in sidebars. Two-column is good for text-heavy rulebooks with hundreds of pages, and even then sidebars help (but I saw books like that laid out in one column, like Apocalypse World and followers, and it worked too). I personally don't like title font too, but I don't think that personal tastes are good basis for reviewing anything.
Artwork is ok, although it is on nearly-homeopathic level, and I have a strange feeling, that setting graphics for Blood Types setting bleed out into universal rules part. Basic artwork is well, basic, nothing more, I don't think that they're good or bad, but it is a pain of most universal systems. Blood Types graphic is better, but it is only one minimalistic setting from many, so it shouldn't be so many artworks for that (especially when for example Ghost of a Chance has almost none of it). Again, I understand people who hate photoshops, but I wouldn't call things I don't like "trash", only "it is not my style".
Thing that this book rules is its content. Rules are short and concise, easy to understand and implement. Of course, adding some more text to explain better some things (like focus, which is perfectly logical to me, but I met some people who had problem with understanding how it works) would be nice. But it is playable even now, and it short form can be considered a form of art too.
Idea, that setting can be put into 2500 words with introductory scenario could seem insane at start, but authors managed to do that, with better or worse results. Ghost of a Chance and Blood Types managed to do that, but it was not so hard, because these are real world-based settings, so describing many things was not necessary. World of Zero shines there, because setting is quite weird and alien, and yet author managed to put it into required word count. World of Esfah is not so good case, because it mostly references outside work, and it is hard to be used without that (mostly free) material. Also, I personally don't like that one setting at all, but I'm not a fan of "classic fantasy", so maybe I'm not a right person to review any such setting.
I can't agree with somewhat harsh descriptions like "trash", "garbage" and such, personally I don't think that any system should be described with these words, and I saw many bad systems here, some priced much higher than these three bucks, and some not deserving even one star. Personally, I'd not to set a price for that book, leaving it to "pay what you want" level, and use feedback to improve product before giving print versions. But it is cheap, playable and looking not so bad. So I give four stars - mostly as encouragement for creators, because otherwise I'd like to set to three.