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 tagged 2D and Indie on itch.io · Upload your games made with Unity to itch.io to have them show up here.
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