Kenney Impact Sounds (CC0)
https://kenney.nl/assets/impact-sounds
Punch, wood, glass and wood-footstep recordings, variants 000–002. Original files renamed brawl-* for runtime.
Creak: Kenney RPG Audio (CC0), https://kenney.nl/assets/rpg-audio
Original recording files, playback pitch varied in Web Audio.
Heavy collisions: impactSoft_heavy_000–002 and impactWood_heavy_000–002 (Kenney Impact Sounds, CC0), renamed brawl-heavy* and brawl-crash*.