May I upload a version of my entry at day 1 and 6 hours of work, and then upload a new file (day 2, day 3...)??
If you really want to upload per day, you can just have one project that's labelled as a Work-In-Progress, then you can upload a daily file of your game in that project. You can have multiple files available in a single project, just mark then as separate versions so people know to download the latest game.