I downloaded Baldi's Basics, and now my Recommended section is full of horror games! I really don't like horror games (with the exception of Baldi), so there should be a way to remove the "horror" tag from my recommended section.
We don’t have a way to explicitly control the recommendations right now. It’s not actually based on recommendations, but on things other people have downloaded who have downloaded/played/rated the games you’ve downloaded. The best way to change your recommendations is to play and rate new things, as it will cause your recommendations to update. Hope that helps in the meantime.