Bubble Brigade! (https://dozen-games.com/zombiecrowd/) — credits

3D models
- Kids: "SWAT" (animated) by Quaternius — CC0 1.0 — https://poly.pizza/m/Btfn3G5Xv4 (recoloured, weapons none, simplified)
- Zombie, chubby zombie ("Zombie", poly.pizza 22K0aSZkHV) and Big Lug ("Big arm", poly.pizza KaVJET0WHx) from the
  Zombie Apocalypse Kit by Quaternius — https://quaternius.com/ — CC0 1.0; the poly.pizza copies of the chubby
  zombie and the big-arm zombie are tagged CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/): credit Quaternius.
- Big Pug: "Characters Pug" from the Zombie Apocalypse Kit by Quaternius (poly.pizza copy tagged CC BY 3.0)
- Helicopter by kazuma — CC0 1.0 — https://poly.pizza/m/EQJ2MECUbx (recoloured)

Everything else (bridge, water, sky, effects, sounds) is made in code for Dozen Games.