That's okay! Happy to help you out here. For me old gold can be a lot of things, but I like to take gold not literal - So old things that are valuable. Valuable not per-se as money, but also emotionally.
At the same time I always try to think of what is easy for me to make right now in a short period, what kind of game do you think you are capable of making right now, realistically? I see you made a sort-of tower-defense vampire survivors, perhaps something similar? First thing that shoots to my mind is a pawn shop owner who has to 'get' (aim) the stuff (enemies in gun box)that is worth selling and avoid getting (shooting) the junk items. Like you want to make sure you hit the golden watch (like with a lasso or something) and avoid getting the worn shoes.
Not that you should do that at all, just some thoughts to get you started. What is going through your mind? It doesn't have to be a fully formed idea yet, just bits and bobs.