Hello!
I understand, I have already found the problem. In summary, the first day of the game is the tutorial and on that day I did not update the "main quest" item in the inventory, I don't remember if I didn't do it because I didn't want to or because I forgot. Once you finish the tutorial, you will always have the item in your inventory explaining what you have to do.
In the next update, I will make the "main quest" item update on the first day of the game as well. If at any time you don't know where you need to go or what you need to do, please write to me and I will be happy to help you as quickly as I can.
Thank you very much for your report! I hope you enjoy the game.