Background music: "8-bit Epic Space Shooter Music" by HydroGene.
Source: https://opengameart.org/content/8-bit-epic-space-shooter-music
Original file: https://opengameart.org/sites/default/files/8bit-spaceshooter.mp3
License: CC0 1.0 Universal public-domain dedication.
License deed: https://creativecommons.org/publicdomain/zero/1.0/
Legal code: https://creativecommons.org/publicdomain/zero/1.0/legalcode
Verified against the author's OpenGameArt listing on 2026-10-10.
Attribution is not required by the listing; included to credit the artist.
No endorsement by HydroGene is implied.

space-shooter.mp3 is the original download.
space-shooter.wav is the same recording converted to 24 kHz mono PCM16
for native playback. Audio is bundled locally; gameplay makes no music
requests to external websites. The recording is roughly 82 seconds and loops.

Sound effects are original procedurally synthesized game audio, not samples
from this recording or another commercial game.