This game another title is Nectaris.

Play as Axis:
     While  you  are  at the the title screen choose the "New game" or
"One  player  continue" option, then hold Select and press I to unlock
as Axis.

Switch sides 
     Hold  Select  and  press  Run  before  selecting  the  one player
continue option.

New colors:
     Power  on  the system, and hold Select to reset. While continuing
to  hold  Select,  select the "One player continue" option and enter a
map name.

Level passwords:

Effect - Password
Level 01 - Enter "REVOLT" as a password.
Level 02 - Enter "ICARUS" as a password.
Level 03 - Enter "CYRANO" as a password.
Level 04 - Enter "RAMSEY" as a password.
Level 05 - Enter "NEWTON" as a password.
Level 06 - Enter "SENECA" as a password.
Level 07 - Enter "SABINE" as a password.
Level 08 - Enter "ARATUS" as a password.
Level 09 - Enter "GALIOS" as a password.
Level 10 - Enter "DARWIN" as a password.
Level 11 - Enter "PASCAL" as a password.
Level 12 - Enter "HALLEY" as a password.
Level 13 - Enter "BORMAN" as a password.
Level 14 - Enter "APOLLO" as a password.
Level 15 - Enter "KAISER" as a password.
Level 16 - Enter "NECTOR" as a password.
Level 17 - Enter "MILTON" as a password.
Level 18 - Enter "IRAGAN" as a password.
Level 19 - Enter "LIPTUS" as a password.
Level 20 - Enter "INAKKA" as a password.
Level 21 - Enter "TETROS" as a password.
Level 22 - Enter "ARBINE" as a password.
Level 23 - Enter "RECTOS" as a password.
Level 24 - Enter "YEANTA" as a password.
Level 25 - Enter "MONOGA" as a password.
Level 26 - Enter "ATTAYA" as a password.
Level 27 - Enter "DESHTA" as a password.
Level 28 - Enter "NEKOSE" as a password.
Level 29 - Enter "ERATIN" as a password.
Level 30 - Enter "SOLCIS" as a password.
Level 31 - Enter "SAGINE" as a password.
Level 32 - Enter "WINNER" as a password.
Sound Test - Enter "ONGAKU" as a password.