Even if the idea of a word game based on facts is a tried and true classic (think of crosswords), the games’ look and outdated mechanic was making it fall behind on a market full of similar alternatives that just feel better.
This is a recurring challenge on the mobile industry, when UI sometimes gets overlooked. There must be good balance between all the different aspects that make up a game (mechanics, in-game economy, UI/general aesthetic, sound…). As getting just one of them wrong can absolute break the game.