Art - https://www.kenney.nl/
Missile art and animation - https://opengameart.org/content/missile-0
Music - Iron Fields by Tsorthan Grove - CC-BY 4.0 - https://opengameart.org/content/iron-fields - Through Space by maxstack - CC-BY-SA 3.0 - https://opengameart.org/content/through-space - Intro bgm - https://opengameart.org/content/space-music-out-there