This is a GREAT effort for a two week jam. I'm quite rusty on strategy games like this, but I have fond memories of games like AoE (though surely this is not a war game). I love the whole Greek theme and everything (what was the inspiration by the way?)
I do have to say, however, that I found it a bit hard to understand exactly how the whole system works. I thought the tutorial was easy and ok, but then even the first scenario that I tried, wasn't sure if and when I was doing things right. Didn't quite understand why numbers go negative (how do we get negative gold coins? Do we borrow?) Also I think you were trying to show purchases and sales in the same place? (when you bought too much numbers are positive, when you sold too much then negative?) Again, that wasn't super clear. Definitely nobody expected you to have it all figured out in just 2 weeks, but this has the potential to be a very neat little game, but some clearer UI/design or instructions might help. I would have liked to see a more thorough 'walkthrough' that teaches the player a bit more about how the system works (with prompts like: 'Hey so now you have too much stone, you should sell it etc') but obviously you didn't have enough time, I get it.
This is one of those little games that has a good chance (and deserves) first place, mostly because it actually is a complete playable game loop (despite the learning challenges I faced - personally). Good job man!