www.godotengine.org/
An open-source 3D and 2D game engine and development environment.
Pretty sure everything is indie on itch.io but just in case you want something extra indie.
Suggest updated description
Games that can be played using only a mouse or other pointing device, and don't require any other input.
Explore games made with Godot tagged Indie and Mouse only on itch.io · Upload your games made with Godot to itch.io to have them show up here.
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