Ok this is amazing, because it kind of teaches rl-skills, which is always a great thing which games do not enough (including mine).
I love the art-style & general theme.
For me as someone who never did trading-stuff, it was a little rocky to jump in, so maybe a tutorial would be good in further development (which you should do, this game is pretty unique).
The chosen bg-music is great. You could do easy improvements by also adding positive & negative audio-feedback to the trading-processes.
Overall: great game!