It´s doing well Google Play due to word of mouth and positive reviews, already in the 1,000 to 5,000 installs league. It´s a complex 3D air combat game made by just 3 guys. The full game has all stages and aircraft and it will not be forcing you to buy extra stuff, zero iap policy. The version gives an idea of the game, with 3 aircraft and 2 stages, not crowded by adverts and banners. Get it following the respective links in this post signature. Gameplay:
