I recently released a game for Android called TetraCube. As of now, I’m having a hard time publicizing the game on a $0 budget. So, I was wondering if Unity had any services that can help me promote my game for free.
You can search for game review sites and ask them to review. Don’t spend money on advertising. A few people will try it eventually and if they like it word of mouth, otherwise no harm, no foul, and no ad dollars wasted.