I put in-game music in the game folder as mp3 files.(8 files) This music was composed by using commercial licensed sound loops. Please enjoy at ease.
Right-click the game name in STEAM app. Click "Manage". Click "Browse Local Files". The mp3 file is displayed.
About the Game
Note that this game is just an arcade game.
A simple operation helicopter arcade game. There are various missions such as destruction of enemy weapons, rescue of hostages, assassination and destruction of enemy facilities.
A game based on the conflict between Willsword (the player's country) and Maxell (the enemy country). 8 levels in all. The game feature that can be easily replayed. Simple control. You can aim at the enemy while stopping on the spot. This is useful, but the pleasure as a flight simulator is halved. Various terrain and weather. Damage caused by a collision on the ground is minimal.Instead, the physical inertia from the impact makes it harder for the player to maneuver the helicopter. The battlefield is 2 kilometers square except for some levels. It will be game over when you go out of the area. The enemy is not only ground weapons, but also unmanned airplanes. Allied flying squadrons will protect you. Since only the machine gun can be used in the first half of the game, you need to aim at the enemy accurately. In the second half of the game, you can use homing rockets, which makes the game play more like arcade games. This game uses music selected carefully from the previous songs composed by Sonic-Alpha.
You need a graphics board to play this game. The graphic settings may optimize the sensitivity of the mouse. I think that the setting of the joystick can be done at the first boot screen. (Test play is not done with the joystick) This game is not good as a flight simulator. (It is an arcade game) It does not officially support joysticks or controllers. (May be usable with key assignment) The play time of the level seems shorter than other games.
Control C: Change camera ESC: Pause, return to menu screen Mouse: Ascend, descend,turning Right mouse click: Change weapon Left mouse click: Shoot weapon W: Speed up S: Speed down A, D: Move the helicopter left and right 
Windows Requirements
Minimum:
OS *: Windows 7,8,10(64bit)
Processor: Intel Dual-Core 2GHz or AMD Dual-Core 2GHz
Memory: 4 GB RAM
Graphics: You need a graphic board to play this game.
DirectX: Version 11
Storage: 4400 MB available space
Additional Notes: You will need approximately 5 GB of free disk space to install the base game and all DLCs.
Recommended:
OS *: Windows 7,8,10(64bit)
Processor: Intel Core i5 7th or higher
Memory: 8 GB RAM
Graphics: Nvidia GTX 1060 or higher
DirectX: Version 11
Storage: 4400 MB available space
Additional Notes: You will need approximately 5 GB of free disk space to install the base game and all DLCs.