Really cool concept, would love to see it get developed further.
I really got invested (ha) in my stock's lives. "Common Drew, beat the drug addiction, I got 300 stocks in you!" "Oh, Remy is over 60 and very sick, better sell my stock" "Damn, Remy got better and lived to be over 80..."
One thing I really missed is a way to buy/sell in bulk. I quit playing when it became a clicker game.