Thanks for playing :)
Yea this game was made for a game jam so I didn't have much time to put in an endgame. I'm currently working on a full version and that's something I'm addressing (along with balance).
I like your idea of mix and matching weapons. To me that's the definition of incremental game: feeling a huge growth of power over time. Balance will be crazy but I'd love to see what adjacent ideas I could do there!