Not sure. Never played the PSP version. Though, the Wiz Yer Muzak thing is fun. You get to feed it your own song, and it beat-matches, etc. I got 121 (or so) trillion with one song, which put me #21 place in the weeklys, and around #156 in the all-time. (Word of advice: You will get bored of your song rather quickly, no matter which song it is.)
Playing the game is fairly simple. You basically hit the bomb and let it explode out. The location isn't very important later on, though if you do it in a complete open space, you're likely not going to get anywhere. The key factor of the entire game is DO NOT DIE. Your goal is to collect the power ups before your shield runs out, and then just immediately hit the bomb anywhere. It is better to hit the bomb prematurely than to let your shield run out and you die. When you die, ALL of your multipliers that you spent many minutes building go down the drain.
As far as power-ups, I prefer white ones first (shield up), then yellow (time up), and then the red/blue ones (quicken and multiplier). Remember not to get greedy (again, dying blows), especially if you don't have any whites to collect (maybe 3-4 seconds), and learn to stop your explosions. If you're trying to get more time (the clock is getting too low), just wait for a few yellows to pop out, stop the explosion, and continue doing that for a while. In fact, when you're getting good, just keep doing that for a while except when you happen to beat match, since the multipliers do give out a good score.
On that super long game, I reached the max 100x multiplier, but my song was out of sync somehow, so it was hard to beat-match. But, basically, that's the key to getting the real high scores: 100x and the 5x max you can get on beat match earns you about 10 trillion on a good explosion. Don't worry about the beat match early on, though, since you can really screw up and die waiting for the next beat.
Rosalina: But you didn't.
Robert: But I DON'T.
Rosalina: You sure that's right?
Robert: I was going to HAVE told you they'd come?
Rosalina: No.
Robert: The subjunctive?
Rosalina: That's not the subjunctive.
Robert: I don't think the syntax has been invented yet.
Rosalina: It would have had to have had been.
Robert: Had to have...had...been? That can't be right.