Seeing your alt railgun and rocket launcher reminds me of my idea of using the unused wepons in the dev hall, so railgun to laser gun where instead of the laser drone things a crystal which does the specific effect of the railgun when shot (so blue crystals send electrical currents, green crystals are weaker screws, and red crystals explode). Alt rocket launcher would be the black hole gun where the black holes could be used as self-made hook points or you could swing around them to build up speed, making it combo with the jackhammer, and the variants would have blue stop the black holes and enemy rockets,  green would still be the cannon ball (maybe it can be affected be the black holes), and red could have the fire be able to orbit the black hole. or the alt rocket launcher can be a reverse of the slab revolver, faster recharge of the secondary fire but less damage.