The unicorn pasture says "Unicorn production: 0.01/sec". I bought an upgrade but the unicorn growth hasn't changed. Don't know whether it's a bug or not.
Oh, I could buy a bag even after wasting all my available money on stats. I had the money for that bag at first and selected it from the shop. After that, I spent all my money on the stats. Then, I clicked on the "Buy" button and I could still get it. Now I have a 3k debt. ._.