Thanks so much for playing! The logic for the weapons follows like rock paper scissors:
Rock > Paper > Scissors
so
Gun > Knife > Bomb
upgraded versions to each flow in the same way
SMG > Machete > Nuke
the difference is the upgraded versions also beat the base weapons that are not their own (ie: Machete beats gun and bomb but ties knife).
There is a known bug where SMG beats Nuke even though it should lose but that was only found post submission so we have a hotfix for that afterwards. Hope this clarifies things. :)