Quoted from kklank:
What purpose do the weapons serve in gameplay.
I've got to figure out what's wrong with my button and why it's not lighting up.
Sorry, I don't know why your Launch button isn't lighting up.
The weapons, in order that they're awarded:
VP-70 Handgun: increase bonus X
Ithaca 37 Shotgun: award 2 Xenomorph hits
M-56 Smart Gun: award the most valuable (*) shot on the playfield
M-41A Pulse Rifle: start 2X Playfield scoring
M-240 Flamethrower: start ball saver
(*) in V1.02 code, this awards "a pretty good" shot... newer code actually awards the shot that is literally most valuable at the time
I hope the weapons add a fun new dimension of play to those who choose to explore them!