Pretty sure everything is indie on itch.io but just in case you want something extra indie.
Games that can be played alone
Projects tagged with the following aliases will automatically show up on this page:
single-player
Unity is a game engine for 2D, 3D, AR and more
Projects tagged with the following aliases will automatically show up on this page:
made-with-unity
Explore games for Web tagged Indie, Singleplayer and Unity on itch.io · Upload your games for Web to itch.io to have them show up here.
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