damage immunity graphic is more obvious
difficulty mode no longer increases after killing final boss (it was too confusing)
tech: Higgs mechanism - you can't move when firing, reduce harm by 60% when firing
removed Galilean group
removed gun flechettes
removed critical bifrication
removed railroad ties
removed incendiary (for nail gun)
nail gun:
needle gun: accurate, piercing mobs, fire 3 at a time
rivet gun: accurate, ballistic arc, doesn't use much ammo
tech: bigger rivets (9x stack)
all nails
radioactive 2s tick (about 70% damage increase)
0.5s full tick
4s longer tick
critical hits -> explosion (from flechettes)
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