Please add Action Adventure, Action RPG and Metroidvania/Platform Adventure as genres.
It would help with searching for specific kinds of games and I'll make sure to help with sorting games into these categories since I've made my own sites about such games.
AdminIGDB (Admin, Twitch) commented
We are already able to categorize games as such with a combination or Genre/Theme/Keywords, however we do intend to do a full overhaul of our tagging system at some point in the future. No ETA yet but we'll notify the community once that happens.