just a wild thought but i think machineguns and laser could use some aditions.
machineguns: early on are good but on the later stages of the game the damage does not keep up with the armor upgrades. i think the game could use a heavy minigun or anything of the likes that trades overall dpm for a higher base damage.
say: twin assault gun: 49 dmg with 187.5 rounds per minute
minigun: 60dmg with 120 rounds per minute
heavy minigun: 80dmg with 60 rounds per minute
lasers: i think they should have some presence in the early game like light gun ---> heavy light gun --> flashlight ---> normal path.