"-I watched my ranking page (playing it on saturn) and aside the score was some figures like 08/08, 10/19 etc. What does it mean?"
I can only
guess that those numbers represent the day in wich the score was obtained...
However, your score isn't so great, but I think it's a good score because you reached stage 6....
I think the key in this game it's especially in rank managing, and think that the most frequent cause of rank jumping it's the loss of the medal chain...
If you lose your medal chain, you have to grab small medals that affect heavily your rank, especially if you grab tons of them destroying the releasing structures, like the rails in stage 3...
Probably, for us biginner it's better to focus on medal chain and powerups limitation, and some boss milking too... bah, this game punishes me without pity whatever strategy I use
But I like it the same

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