Nice game!
Found a bug:
With at least 2 type of seeds, while holding one of them, if you click on quick plant, the seeds you are holding will disappear, and plant the other one. I found it, thinking I could select the seed to plant, like the produce selling in the market.
As a suggestion, how about adding fertilizer and irrigation? They could help reduce the growing time of crops.
An autoplanter and autoharvest (and even an autoseller) would be good. Could be a repetitive update, each one reducing the interval.
Since there's no actual use for the produce except selling it, how about adding a factory component for turning them into others, more profitable items, like potato into flour, or turnips and carrots into livestock feed?