In no particular order:

The Forgotten City - (loved it)
Rain World - (love/hate. Unique game where you play as a slugcat)
Hollow Knight - (someone said it, but I second it. 10/10)
Celeste - (same as above)
Furi - (very cool, bullet hell, great music)
Hotline Miami - (top down fun and murder lol)
Firewatch - (a good linear story)
Stanley Parable - (choices, choices 10/10)
Don't Starve Together - (survival, great art style)
Fez - (a really cool puzzle platformer)
Undertale - (should you kill?)
Dead Cells - (pretty hard, but fun)
The Forest - (horror survival)
Subnautica - (ocean survival. Thalassophobia)
Amnesia: The Dark Descent - (horror story)
What Remains of Edith Finch - (good linear story)
Outer Wilds - (I loved this one so much 10/10)
The Witness - (cool game, puzzle)
Outlast - (horror, damn good)
Deep Rock Galactic - (Rock and Stone!)
Blasphemous - (Spain inspired metroidvania)
Abzu - (a very cool ocean experience)
Soma - (linear horror story)
Untitled Goose Game - (be a goose)
Goat Simulator - (be a goat)
Thumper - (Music, beetle, on a rollercoaster)
Journey - (go on a journey)
Risk of Rain 1,2 - (lots of fun)
Slay the Spire - (a very good turn-based card game)
Overcooked 1,2 - (fun co-op that gets hard)
Unravel - (puzzle about yarn)
No Man's Sky - (has gotten good since launch, I was at launch)
OlliOlli - (side scrolling skateboarding)
Minecraft - (you should know)
Terraria - (you should know this too)
Ancestors: The Humankind Odyssey - (not sure if indie, but I love it)
Descenders - (procedural mountain biking)
Everything - (well, it's everything feat. Alan Watts)
The Swords of Ditto - (top down metroidvania?)
Tails of Iron - (9/10 metroidvania as a rat)
Ghostrunner - (fast hack and slash awesomeness)
Rimworld - (management sim, crash landed)
Slime Rancher - (be happy farming slimes)
Deadbolt - (play the reaper, like Hotline Miami but side scrolling)
Kingdom New Lands - (manage your kingdom and survive)
Limbo/Inside - (two games, puzzle and strange)
Super Meat Boy - (speedy puzzle platformer)
Downwell - (arcade game about going down a well)
Thomas Was Alone - (minimalist puzzle platformer)
Human Fall Flat - (try to platform, funny)
Spiritfarer - (cozy management game about dying)

Well, that's about all I can remember playing. I enjoyed all of these games and they are 7/10+ Anyways, whatcha think?

(Oh yeah, you can use dekudeals.com to track prices/deals. You can sign up to make a wishlist and be notified when it goes on sale. You can also define the price you like to be notified for. Good stuff)