The search bar is for discovering content by name. It will also suggest tags if you are trying to find content by a topic. If you are trying to find multiplayer shooter games then I recommend using the browse page for that: https://itch.io/games/genre-shooter/tag-multiplayer
But we all know the most common way for users to search content on sites is to use the standard, easily accessible, and always onscreen search bar.
Often when people post topics about search results it’s because they’re trying to optimize their game’s placement on the results page, and they may have a misconception of how games are discovered on our platform. My recommendation is to use accurate tags, and grow your page organically so it can be elevated in our discovery algorithm.
People finding content by topic will be using tags. The search autocomplete will push someone trying to type a topic name into the search bar to the respective tag name. There is likely very little discovery of content on the search results page for queries that use topic names, so trying to optimize your page for that result is likely a dead end.
Here’s some more information about how search currently works: https://itch.io/docs/creators/getting-indexed#limitations-of-search