The scoring system has been renewed.
A few lucky wins can no longer elevate a new account to the top: experience counts, long matches are valued more, and a single match can no longer influence the score by hundreds. Everyone's score has been recalculated once based on match history; some have increased, while others have decreased.
Additionally in 0.4.2: Premium, daily puzzles and level map, energy packs in the store, deeper board and new Pastel Terra theme, Tools tab, match watching, and many stability fixes.