You collect enough blue orbs to open the ideya capture (the cage thing), and then go around the course as much as you can to score as many points as you can, then return to the palace thing where you started before the time runs out.
Collecting orbs and flying through hoops in quick succession creates chain combos which stack up to score points. it's all about finding the quickest path between the scoring opportunities and accurately steering to maintain your chain. I'm shite at it but it's still fun.
Each level has 4 courses, so when the time runs out you go back to the palace and the path around the level will change and you start again. After the fourth, you're teleported to the boss.
You need to get a reasonable overall score in all the levels to unlock the final level.
The video I posted is of a very early, easy level, where you have heaps of extra time in which to get the objectives done. To get a good score you have to go around a lot though, because there's so much time.
Once you've completed the game it becomes a very deep, very difficult score-attack game. Hence the website http://www.scoreattack.net/.
( Edited on 10.07.2007 16:14 by Grumbler )