Really fun game and I think "Old Gold" can be taken a few ways from this. It has a very retro feel to it too.
I think the only think I can nitpick on other than the money bug is that I wish the controls were stated a little more generic because it throws me off that it says for example "k" to sell when k or x works, but I guess my brain would make more sense if it was A and B because it is what I am used to.
Either way really fun for a Game Jam Game and minimal bugs. I think a full release would be fun allowing for even more potential to make big builds, but it's nice and simple as is.