No, your game is still indexed, but games don't stay at the top of any listing for too long. And game search is optimized for full title searches. Hope this helps.
That section might be curated by our admins, I'm not sure. Or else it uses a more complicated algorithm. Edit: either way, games on the front page are definitely rotated often, even more so that in other sections, and that's on purpose, because space is so limited.