The free Flies, fly away! demo is available on Google Play! You can play it today! This is a reduced version of Flies, fly away!. For exemple, you will encounter no boss, there is no bonus object to catch, nor game mode to unlock. The rules are those of the "hardcore" game mode from the full game. It's a smaller version but you can still compete with the players of the demo and the full game from around the world through a Google Play Games leaderboard. It is free but it contains no ad. It does not require any special permission (but using Google Play Games features may require network access). Yes! You understand well! Free game with no advertising nor special permission requirement!
The website is online and you can get information about the YLMiniGames games being developed.