I do agree with you , and I was planning to make one, but in the end, I've decided not to and instead I've spent time adding far more tooltips, eg, when you drag over the amount of dollars you possess, there will be a tooltip about dollars shown to you.
I'm not overly confident in making a tutorial that wouldn't be annoying to players, and therefore decided to move my effort towards providing additional information to players with tooltips and an additional mini-tutorial in the upper left corner.
Thank you for playing the game and giving your feedback!
Have a great day! :3
Leon