Search Categories: Relevance
The Search Categories API doesn't seem to apply any "relevance" and direct matches are not often the first result.
Please apply relevance sorting.
This means to just get a game from a user-input string, One needs to either get ALL results from the search endpoint and check for the best match or use the /games endpoint with exact matches.
This is especially notable with the example of "Hyperdimension Neptunia", which exists as that game alone, but the first found result is not the exact match, but rather "Hyperdimension Neptunia Re;Birth 1"