Eight credits:
Hold R + L + C + Right as the game loads.

No information display:
Press L in Saturn screen mode to remove the score and life bars.

Full screen side-scrolling mode:
Enter the options screen and set up the control for Saturn mode and the screen for arcade mode to get an excellent full-screen sideways shooter. However, you can not remove the score and life bars form the screen for more visibility as in the Saturn screen version.