As others have said in their reviews and comments, it is nice to have all of these riddles and puzzles collated into one document. However, there's really nothing unique here that is deserving of the $0.99 price tag.
One way to improve this as a product would be to build in scenarios for how these riddles and puzzles could be integrated into a dungeon or campaign without it feeling forced or artificial. That is one of the really big weaknesses of this type of puzzle that a resource like this could really help DMs with.
As it stands the $0.99 price tag is really only worth it if you are too lazy to google "riddle" or "puzzle", because I'm sure you will find the same ideas for free elsewhere.
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