You can't go more indie - new genre that is even difficult to name, novel concept that you probably never seen in the past, and (almost) just one man production
https://store.steampowered.com/app/1379550/The_USB_Stick_Found_in_the_Grass/You are given a (virtual) copy of a USB stick that was found in a place of a possible crime and your job is to find out who the owner was, whether it is related, whether something happened at all and so on. You are not given any tools, but you are armned with Windows and any software you decide to install and use. So how do you investigate? Browse, examine, check, cross-check, deduce... Anything goes!
The only thing that is not entirely indie is the fact that at the moment game is only on Steam, but I do plan to put it on itch.io, just being one man army I had to make some choices to limit amount of work.