WEAPON AUDIO

rifle-voxiom.wav:
Source: user-provided "gun sound.mp4", recorded by the user from Voxiom.io.
Extracted window: 00:09.700 through 00:10.320 (one shot at the end of a burst).
Edits: mono 48 kHz PCM conversion, DC removal, peak normalization,
1 ms attack fade and 80 ms tail fade. Original pitch and timbre retained.
The original game's sound is not covered by the CC0 licenses below;
no redistribution license was supplied for this recording.
Rebuild with scripts/import-rifle-recording.py and the original video.

bullet-stone-*.wav, bullet-metal-*.wav, bullet-wood-*.wav,
bullet-dirt-*.wav, bullet-hit-*.wav:
Derived from Impact Sounds by Kenney (CC0 1.0).
https://kenney.nl/assets/impact-sounds
https://creativecommons.org/publicdomain/zero/1.0/
Sources: impactMining, impactMetal_heavy, impactWood_medium,
and impactSoft_heavy, variants 000 through 002.
Edits: layered material/cloth contacts, attack trim, EQ, short decay,
mono 48 kHz resampling, normalization and fades.
Rebuild bullet samples with scripts/build-weapon-audio.py.

launch-0.wav, launch-1.wav:
Rocket Launch Pack by dklon
https://opengameart.org/content/rocket-launch-pack
License: Creative Commons Attribution 3.0 Unported
https://creativecommons.org/licenses/by/3.0/
Sources: rocket_launch_1.wav and rocket_launch_2.wav.
Modified: shortened to 1.15 seconds, normalized, exhaust decay and tail fade.
No endorsement by the author is implied.

OTHER AUDIO

boom-0.wav:
Muffled Distant Explosion by NenadSimic
https://opengameart.org/content/muffled-distant-explosion
License: CC0 1.0, https://creativecommons.org/publicdomain/zero/1.0/
Original is a recorded log-drum impact with reverberation, designed as an explosion.
Edits: mono, peak normalization, tail trim and fade.

All .ogg files: Impact Sounds by Kenney
https://kenney.nl/assets/impact-sounds
License: CC0 1.0, https://creativecommons.org/publicdomain/zero/1.0/
Unmodified selected foley samples. Original license: Kenney-License.txt.