Hmm, well, maybe they are just not “good enough” games, or too niche, or target wrong audience or don’t have enough exposure. All this have to be solved by devs in any case.
I haven’t played Formata for example but visual content in it is bare-bones - like it uses UE4 mannequin for character models. Which I don’t mind at all but some people got really angry about it. Imho if decent gameplay is already there, proper art is something that dev could commission later. Let’s look at some stats:
As you can see, it’s already sold decent amount of copies since launch and have mostly positive reviews.