Links to all third-party assets can be found below.
We have checked all assets to the best of our abilities and made sure they can be used for our game, by checking for creative commons, free-use licenses, terms of use legal agreements or permissions to use in an educational context or for commercial and non-commercial video game development.

All assets made by ourselves can be used, modified and distributed freely without attribution (Public Domain).

------- MODELS ----------

Zombie:
(c) Adobe Mixamo
Terms of use under www.adobe.com/legal/terms.html

Brick Wall:
Model:
(c) Marc Putz & Fabian Holzschuster
Texture:
Found on www.3dtextures.me/2020/09/17/brick-wall-019/
CC0 Creative Commons License - Public Domain
Specular map created from inverted roughness map

Wooden Crates:
Model:
(c) Marc Putz & Fabian Holzschuster
Texture:
Found on www.ambientcg.com/view?id=Planks037A
CC0 Creative Commons License - Public Domain
Specular map created from inverted roughness map

Concrete/Pavement Ground:
Model:
(c) Marc Putz & Fabian Holzschuster
Texture:
Found on www.3dtextures.me/2022/03/09/concrete-019/
CC0 Creative Commons License - Public Domain
Specular map created from inverted roughness map

Wood & Metal Roof:
Model:
(c) Marc Putz & Fabian Holzschuster
Texture:
Found on www.3dtextures.me/2022/09/16/wood-metal-platform-001/
CC0 Creative Commons License - Public Domain
Specular map created from modified metallic map

Beer Bottle:
www.free3d.com/3d-model/-oz-beer-bottle-v1--386973.html
(c) User: printable_models
Slightly modified model for lower polygon count
Changed beer sticker texture

Button:
www.3dmodelscc0.com/model/button-wall-module
CC0 Creative Commons License - Public Domain

------- IMAGES ----------

Bullet:
www.rawpixel.com/image/6334912/png-sticker-public-domain#eyJrZXlzIjoiYnVsbGV0IHdhciIsInNvcnRlZEtleXMiOiJidWxsZXQgd2FyIn0
(CC0 Creative Commons License - Public Domain)

Lifebar:
(c) Marc Putz & Fabian Holzschuster

Zombie Blood:
(c) Marc Putz & Fabian Holzschuster

Beer Sparkle:
(c) Marc Putz & Fabian Holzschsuter

Beer Icon:
Image taken from 3D model, source can be found under the Models section.

------- SOUNDS ----------

Zombie Grunts & Attack Sounds:
(c) Fesliyan Studios (www.fesliyanstudios.com)
License policy under https://www.fesliyanstudios.com/sound-effects-policy

Gunshot Sound:
(c) Fesliyan Studios (www.fesliyanstudios.com)
License policy under https://www.fesliyanstudios.com/sound-effects-policy

Gun Reload Sound:
(c) Fesliyan Studios (www.fesliyanstudios.com)
License policy under https://www.fesliyanstudios.com/sound-effects-policy

Wooden Crates Sounds:
(c) Fesliyan Studios (www.fesliyanstudios.com)
License policy under https://www.fesliyanstudios.com/sound-effects-policy

Footstep Sounds:
(c) Fesliyan Studios (www.fesliyanstudios.com)
License policy under https://www.fesliyanstudios.com/sound-effects-policy

Button Click Sound:
(c) Mixkit (www.mixkit.co/free-sound-effects/click/)
Mixkit Sound Effects Free License

Beer Collect Sound:
(c) Mixkit (www.mixkit.co/free-sound-effects/win/)
Mixkit Sound Effects Free License