Instructions:

Left and Right Arrows: Rotate ship

Up Arrow: Thrust

SPACE: Fire main weapon(s)

Z: Fire bomb weapon (area effect, uses energy)

Down Arrow or SHIFT: Shield (will recharge...)

S: Enable or disable sound effects

R: Switch between Modern and Retro graphics

Escape: Pause the game

DEBUG Keys:

L: Skip level

A: Add asteroid

E: Add enemy ship