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.
They are hidden, so I don’t know about them. Sorry I couldn’t be of more help.
Shadow of the Forbidden Gods - a strategy game where you play as the ancient cthonic entity waking up because the stars are right. Set in a fantasy world where the forces of good slowly become aware of the coming apocalypse and attempt to forestall your return. You have to get past the janky UI and some dreadful AI art, but the gameplay is unique and satisfying.
Signalis
Antichamber
Cave Story
The Beginner’s Guide
Uplink
Hypnospace Outlaw
Exit Fate
The Red Strings Club
Oolite
LocoRoco (not an indie gem but forgotten)
Black Souls 2
Null Gravity Labyrinth for everyone who likes labyrinths