This sounds about right. Out of all the people that see your game in the search results, a small percentage will click on it. From the people that click on it, a small percentage will download it. From the people that download it, a small percentage will leave a comment/review/follow you.
The only thing you can do, is influence that percentage to be as high as possible. You can do that in multiple ways including (in no particular order):
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Make better cover art. This will make more people click in your game if they see it while searching.
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Improve the project’s page. Screenshots, videos, art, and a nice detailed description that will give users an idea of what to expect if they decide to download it.
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Make a better game. Yes, that’s a tough one. Theoretically this can be said about all games out there, but if a lot of people are downloading a project, but don’t talk about it, this could suggest it could become even better.
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Participate in communities so people get to know you. This might give you some followers, especially early on, until your projects take off.
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Keep in mind that game dev is a “competition”. To attract more users you need to make something “better” than what other people are making.
Judging by the numbers you provided, it all looks normal. ~20 downloads means there’s low chances of one of them commenting. Think about how many games you’ve played in your life, and how many times you left a review/comment on a game.