Relax Mode sucks a lot anyway...
Its just an automatic slow scrolling vision of a bay and a town at night, with fireworks shooting up all the time...
All you can do there is turn the auto-fire off and fire yourself, and change the theme of the fireworks to one of the arcade level themes... and that's all.
But Mission Mode... now THAT's a worthy challenge, there are lots of hard missions.
Mission 21 is insane, i barely believe i just completed it finally, yay!