Ansimuz
Ansimuz's itch.io library offers pixel environments, characters, animation, interfaces, sound effects, and music across platformer, city, space, and gothic themes.
Why use it
Cohesive series can establish prototypes or complete levels quickly and give indie developers an editable base for additional art.
Where it fits
Use art, animation, audio, levels, and narrative to make the game easy to read and its world convincing.
What to check
Licensing is defined per pack: some releases such as GothicVania Cemetery are CC0, but that cannot be assumed for the whole catalog; retain each product page and license statement before commercial use.