Howdy! I started Emotional Mecha Jam.
People above have given reasonable, standard answers. I'd like to offer two other possibilities:
1) Make the tags freeform. This is one of the beauties of bandcamp.com: You can make tags for whatever. This means that you can find the big things everyone looks for (metal, rock, r&b, etc) but also that you can find intriguing and evolving microgenres as they evolve (vaporwave, pzacore, apocalyptic folk, aleatoric). I don't know if this is possible given your software, but imo would be optimal.
2) Sidestep the media-bound classification and make tags for emotional, mood, sexual, etc content in the style that Archive of Our Own (A03) and other fanfiction communities do it. When I'm looking for a game I don't care if it's a board game or a video game, I am trying to fill an emotional need. Do I need a game to make me happy? sad? jealous? Freeform tags solves this, but if your software doesn't allow for that, please expand all tagging options, across media to include this.