Demonstration video: https://youtu.be/GBqv9EBXm7A
https://freesound.org/people/SoundFX.studio/sounds/464564/ Gun sound
https://freesound.org/people/Fight2FlyPhoto/sounds/142898/ Enemy engine sound
https://freesound.org/people/TheRandomSoundByte2637/sounds/607776/ Friendly engine sound
https://assetstore.unity.com/packages/vfx/particles/particle-pack-127325
Standard unity particle pack
https://www.actionvfx.com/collections/free-explosion-sound-fx Explosion Sounds
https://freesound.org/people/qubodup/sounds/332058/ Bullet impact sounds (cut up)
https://www.alldesigncreative.com/3d-textures/green-grass-texture/ Grass