Great round of feedback, thanks for taking the time! Few things I'd like to respond to:
The whole "picking up" weapons thing is going to get an overhaul at some point, with things like
- Loadout slots to store 2 (one for each hand) or 1 that goes on both hands
- UI or some sort of indication of durability
- Every weapon will have charging attacks but will still be throwable
- A button to swap which hand it's using or a way to equip it in the opposite hand by holding the interact button or something
The design of the castle is indeed pretty whack, I rushed it, I've just uploaded a revision that at least makes one room make more sense but it doesn't quite fix it.
Now as for the Bubble Gun while I think it's a good starting point and something that will be relevant through the whole game I do have plans to make a few magic weapons that might not be as memorable but will be decent counterparts and complements to it.