some suggestions
when we swap weapons the other weapon should drop and we should be able to swap again
more weapons
and the "more damage" power up should be replaced with insta kill
and for the workstation we can put weapon in it and it will take sometime (like 1 min) then it will change the gun skin and add like an optic (red dot sight or any optic), laser light and increase magazine size like for mp40 32 to 42 all gun will have the same skin (after upgrade) the skin will be glowing
and the game is fun keep it up :)