This.
Played some Arcade mode on Epsilon 1 last night, tried to be as accurate as possible, didn't get hit, 100 percented the level, had the 9x multiplier thing active and came out with a score of 430,000. Topped my friends list - Yay me...Although, I should add that only 4 other people in my friends list have played this stage in Arcade mode

.
Anyway, checked the leaderboards and the player at number 1 has 1.3 million points on the same level! How the hell is he doing that?! Would love to see some videos of people getting these types of scores.