Thanks for playing!
I do think that i should've improved the tutorial, but i just didn't have enough time. I would definitely update the game if it would have enough attention.
Currently, the pool of items (or, at least, weapons) is not expandable without adjustments to the UI. It would take some effort to make the UI and the sprite table (TIC-80 problems) work for a pool larger than 15 tiles on each category. I thought it would be enough for now but in the future it would definitely need a rework.
Also, if i would update the game, i would probably rewrite the whole game to Love2D instead of TIC-80