Spelunky. My Vita was basically a Spelunky machine.

Cave story the og ... man what a game

Bug Fables

It's a really well done RPG in the spirit of the original Paper Mario games. Charming and fun to play. Got some depth to the build choices using a similar badge system as Paper Mario or even Hollow Knight.

Citizen Sleeper, one the the best games, not just indie.

Off the top of my head:

• Against the Storm - I find the loop of those first 30-40 minutes of city building very satisfying.
• Ultimate General Series - I love the land battles, it scratches that gun powder Total War itch.
• Mount & Blade Series - Playing the Viking Conquest expansion while watching or listening to the Last Kingdom (Saxon Stories) might be one of my favourite gaming memories.
• Sea of Stars - Reminds me of Golden Sun. And the soundtrack is just fantastic.

Disco Elysium. Best writing and storytelling I've ever played.

Cataclysm: Dark Days Ahead (ASCII mode) and Neofeud hold a special place in my heart

Shattered pixel dungeon Many hours put into this game

Valheim is one of the best, especially with frends

The Oregon Trail, Pong, Myst, Doom, Worms, Transport Tycoon, Tetris...

Binding of Isaac. When it finally came out on the switch, I played it more than Breath of the Wild.

Inscryption

You are in a weird cabin in the middle of the woods playing a card game with your fate on the line. Some of your cards are talking to you and comment on how you play.

Then things get weird.

For those that like Inscryption, honorable mention for Hand of Fate 1 & 2

Are Journey and Outer Wilds considered indie games?

Does STALKER count? I love the atmosphere of the games.

If not I've sunk a lot of time in Mini Metro

Hotline Miami. Would appreciate recommendations of similiar games.

I played A Short Hike recently, and I was transported. It's a painterly little adventure in which you walk and glide your way through an archipelago, meeting people and solving small puzzles, mostly around platforming. It's amazingly soothing. First game my wife actually enjoys too, and she's not into games at all.

Not technically in their bedrooms but made by students - Narbacular Drop. It was the game that spawned Portal. It’s not a great game, per se, but I’ll never forget the paradigm-shifting moment I had when I realized what was happening.

Valve ended up hiring the entire team to work on Portal.

Fight N Rage was my favorite beat'em up before Streets of Rage 4 released, made by mexicans I think, very stylish and manga influenced, tons of juggling and branching paths.

Valdis Story was the hollow knight of it's generation, awesome metroidvania with great bosses and combat with good combos, but it didn't get tiresome like castlevania mirror of fate because regular enemies weren't health sponges, bosses were where you let loose.