unity3d.com/
Unity is a game engine for 2D, 3D, AR and more
Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.
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Pretty sure everything is indie on itch.io but just in case you want something extra indie.
Explore games made with Unity from the last 30 days tagged 2D and Indie on itch.io · Upload your games made with Unity from the last 30 days to itch.io to have them show up here.
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