coral briar
If you were to add new weapons, here's what I would do: Create 2 new weapons. 1 that can be obtained by doing or completing an existing feature. That way, anyone who has %100 the game, already have it. The second one needs to be unlocked by doing something relating to a new feature, that way completionists have to actually do something to unlock it. Just a suggestion, but that is what I would personally do.
olive smelt