If I browse games in general, I mostly get crappy lo-fi horror games, not gay visual novels. I only get a lot of gay visual novels if I deliberately search using the "visual novel" tag, and even then the LGBT+ visual novels don't really crowd out the non-LGBT+ visual novels. There's a lot of stuff there that I'd like to filter out, but it's all different stuff that I'd like to filter out for different reasons.
Filtering for only completed games is actually possible. From the home page, click on "Directory" at the bottom of the screen, then choose "Released" from the "Release Status" category.