16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.
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Pretty sure everything is indie on itch.io but just in case you want something extra indie.
Explore games that last a few minutes tagged 16x16 and Indie on itch.io · Upload your games that last a few minutes to itch.io to have them show up here.
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