In options. Go to game options and you will see a place called, Timing. Press left and make it to -8. Now, go to Challenge Mode and go to the Paramount Missions[if unlocked], and select the Insaner mission. It will now be way easier to get goods then when the arrow timing is at 0.
This is likely more of a bug/glitch in early versions, but while playing Quest Mode, if you keep stepping on any step during a song, even if it's not on a corresponding step arrow, your score will keep going up slightly. It's not very much (only .02-.05 points each time) but it can add up quickly!
To unlock all of the songs that you don't have, go to the credits game (options.. credit options..) and instead of doing the correct steps, do the opposite. For example, if there is an up arrow, press as if it's a down arrow. Keep doing it and you should hear an applause even though it seems like you're failing. Once the credits game is done and you've done all of the opposite steps, you will unlock all of the songs you do not have one by one.
To unlock the dancers B' & Honey, play Quest Mode and buy the puzzle pieces to complete each puzzle (roughly 144 in all, 72 for each). When a puzzle is completed, that dancer is unlocked.
To unlock this song, simply play all the songs in the game (that are currently unlocked). You don't have to clear them, just play them. And here's a tip for anyone playing this song: slow the arrow speed down to 0.5 because it's insanely fast, even on beginner.