We submitted the project right before the deadline, so didn't have enough time to mention all the assets we didn't make from scratch:
Images used for materials:
macrovector / Freepik
Kbibibi / Freepik
Free assets from Unity Store:
Andrew Hartz - Brick Material Red Rough-Hewn
Nobiax / Yughues - Yughues Free Rock Material
YalçınKaragözler - Nice Materials Pack Vol.
Camisado Studios - Stylized Wood Textures