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
Explore games for Windows from the last 30 days tagged Indie and Singleplayer on itch.io · Sell your games for Windows from the last 30 days on itch.io to have them show up here.
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