Sky Force Anniversary is a classic vertical shoot-em-up game developed by Infinite Dreams Inc. and published by Crunching Koalas. The game is a tribute to the old Japanese arcade machines, with its challenging gameplay and flashy graphics.

In Sky Force Anniversary, players control a plane and fight against hordes of enemies while dodging their attacks. The game features multiple planes, each with their unique stats and gameplay. The primary objective of each level is to reach the end without getting destroyed by enemy planes, with the difficulty increasing as the player progresses through the game.

The game also features several boss fights and side objectives, such as destroying a certain percentage of enemies, saving all the people present on the level, or completing the level without getting any damage. Additionally, Sky Force Anniversary features a balanced economic system where players are awarded stars upon destroying an enemy plane, which can be used to upgrade their plane or purchase new ones.

Unlike its predecessor, Sky Force 2014, Sky Force Anniversary is not a free-to-play title and does not rely on microtransactions in its gameplay. Overall, Sky Force Anniversary is a well-designed game that offers a fun and challenging experience for fans of the shoot-em-up genre.