If you want to keep your game progress, you need to close a video game properly.
1. Save your progress in the game.
2. Click the Exit button in the game.
3. Wait at least 30 seconds up to 1 minute until the cloud is synchronised with Boosteroid.
4. Unless you need to click Exit in the game launcher, close the browser tab.
5. Wait at least 5 minutes before launching a new session.
At this point, the game progress and achievements are sent to cloud servers of a corresponding digital platform (as Origin, Steam), and stored there until you get back to the game next time.