when i go to the upgrade screen the game continues and i get killed if i don't pick fast, i really think that should be changed, use freeze_mode = 1 to stop all entity movement, so that the game is "paused while you are in the upgrade screen, or else it's not very fun, but overall a nice spin on "crimsonland" mecha-style, although i think it's kinda odd to be fighting zombies, but that's me...