It's gotta be:
Command and Conquer 3: Kane's Wrath
Other honorary mentions:
- Outer Wilds (my best gaming experience so far, but low replayability)
- Skyrim
- Shapez 2
- Prey
- Naev
- The Talos Principle
It's gotta be:
Command and Conquer 3: Kane's Wrath
Other honorary mentions: