Yes, some are not helping, others are :)
It depends on the color, lemme look it up. If I didn't mix up colors, it's like this:
one just makes the enemies multicolor (white)
one increases the enemy shot speed (orange)
one makes the player multi color and increases the player shot power (yellow)
one makes enemy shots move towards your ship (brown)
one is moving enemies down a line (if possible) (light green))
one increases the player shot power (light red)
one awards an extra live and increases the player shot power (light blue)
one makes powerups move away from the player (cyan)
Hope that helps!