3D models:

https://assetstore.unity.com/packages/essentials/starter-assets-first-person-cha...

Unity Technologies, Starter Assets - First Person Character Controller

https://assetstore.unity.com/packages/2d/textures-materials/sky/starfield-skybox...

PULSAR BYTES, Starfield Skybox.

https://assetstore.unity.com/packages/2d/textures-materials/brick/tileable-brick...

Game Ready Studios, Tileable Bricks Wall

https://assetstore.unity.com/packages/tools/physics/interactive-physical-door-pa...

Art Notes, Interactive Physical Door Pack

https://assetstore.unity.com/packages/2d/textures-materials/wood/wooden-floor-ma...

Casual2D, Wooden Floor Materials

https://sketchfab.com/3d-models/bookshelf-art-nouveau-a917f1bb22124b63a4ac2938de...

MightyPinecone, Bookshelf Art Nouveau

Sound:

https://freesound.org/people/PostProdDog/sounds/578490/

PostProdDog, Heavy stone door opens

Particles:

Dust cloud texture for particles:

https://github.com/etredal/FogTutorial/tree/main/Assets/Fog

Etredal, ParticleCloudWhite.png

Found via this video:

https://www.youtube.com/watch?v=UllkvfMR96s

Tutorials:

Brackeys – How To Make A Video Game

Particles:

Alexander Zotov

Brackeys

Materials:

PlusEqual

Game Dev Academy

Timeline:

Brackeys

Stone Baked Games

Luke Jenner

Importing Sketchfab Files:

Learning Lab Media Team