Which indies did you discover and would love more people to know about? I’ll start: The Pale Beyond. Not sure if it’s a hidden gem tbh, but it’s such a good story rich game. I laughed, I cried and felt the characters struggles. If you like story rich games/ choices matter, check it out.
Ostriv, an 18th century city building game. I believe it is just the single developer based in Ukraine.
Live For Speed, this one isn’t quite “hidden” but is overlooked by many as it is not on any storefronts. Sim Racing history and still going strong today with the 3 original devs.