I am on switch, which has no dedicated bug reporting area.
have restarted the game 3 times now trying to see if it make difference and nothing, each restart I have gotten to about level 50, up to the alien ship.
Hope someone sees this and can help because I really enjoy playing this game, and would like to experience all the weapons rather than just the handful i have, think the most exotic is the alien swarm launcher i think.
Really sorry about that. We know about the problem, and it will hopefully be fixed with the upcoming update. Unfortunately, preparing the update takes longer than expected. We hope to update both Switch & GOG versions as soon, as possible. Thank you for your patience & once again, sorry!