It is not necessary for your game to be finished to enter the festival. In the case of games still in development, it is necessary that their main mechanics are properly implemented and functional.
In this case, it is not necessary to submit the entire game. However, we do recommend that you send a build containing the parts of the game that already have their visual and sound resources finalized and implemented.
Make sure your game is already able to offer the player the full experience of your project before submitting it.