Last build introduced weapon mods; this one makes them the whole progression system. New channels: PROJECTILE COUNT (+1 barrel), BLAST RADIUS, HOMING (adds tracking to a weapon that had none), DAMAGE RAMP, BEAM POWER — plus hitscan channels, so beams have progression instead of being dead ends.
Because a weapon can grow along a channel now, the old one-off upgraded weapons are retired: TWIN ROCKET and SEEKER MISSILE are gone, replaced by taking COUNT or HOMING on the base weapon. Gold weapon cards arrive already modded, the HUD shows mod pips per weapon, and the swap screen tells you what a swap costs.