Done!
I'm reporting here as a reference, if someone else is interested.
my highscores table as it appears in game is attached
I found that the line is made of several parts
section 1
0°Angelo°-16744448°
player name
Then I thought I recognized a pattern:
map seed,win/lose(1/0), complete/incomplete(1/0) ,scores, game lenght in seconds, ratios, kills and most used ship, followed by player game,type of ai(ai1/ai2), and than something that seems a bitmap and a lot of 0/1, a "false" and again numbers (positive and negatives).
This pattern seems to repeat for every line in the highscores.
section 2
951802539²0³1³951802539³595972³595972³1³28177³127³127³7412³1015³951802539³Angelo³26³4³160³12288³16384³0³1,0,30,0,,0,1,0,1,1,1,1,1,1,1,1,0,0,1,0,28177,False,,,,,1,2,1,0,1,1,0-1-1-2,5-1,,0,0,0,0,0,1,1,
section 3
±408354004²1³0³408354004³494³494³1³78³100³100³0³0³408354004³Angelo³25³25³0³24576³24576³0³1,1,30,0,,0,1,0,1,1,1,1,1,1,1,1,0,0,1,0,-1,False,1-2-3-4-5,,,,1,2,1,0,1,1,1-2-2-1,,,0,0,0,0,0,1,1,
section 4
±221853565²1³0³221853565³494³494³1³50³100³100³0³0³221853565³Angelo³25³25³0³24576³24576³0³1,1,30,0,,0,1,0,1,1,1,1,1,1,1,1,0,0,1,0,-1,False,,,,,1,2,1,0,1,1,1-2-2-1,,,0,0,0,0,0,1,1,
finally I think there's the achievements section.
section 5
°117²-8588271881141271872±95²-8588270051310653212±88²-8588269977508587098±105²-8588269975203575259±106²-8588269971601219216±118²-8588269961498261359±107²-8588269175250290294±89²-8588266073434775101±84²-8588262200937636195±4²-8588262187274524710±90²-8588260430776302002±85²-8588260013783037446°1
Keeping only section 1 (player name) and section 5 (achievements) did the trick.
If I have time, I'll investigate more about other values in highscores section in future.