Sure, you can do that. The idea is to movitvate devs to finish their games. However you would have to state your intentions in your attached devlog to your entry. Write what you want players to give you feedback on. The dev log helps you keep track of what you have done and also what you intend to do to improve your game. This is a great benefit to both you and your players.
Note: - The jam duration only serves as a window to get your entry in. We do not hold devs accountable to only work during the jam duration. You can work on your game how long you want, even now. The aim is to finish your game.