First time i did not understood what exactly i had to do but when i figured it out it became interesting. In full screen in 4k res for me the it does not show the full game, the controls got hidden but besides it a fun game.
You can submit as much as u want, u cannot go for new features i guess, bug for bugfixes in the rules you can (like, a button not working, crashes and so on).
Bug fixes allowed after deadline —just keep your original submission up and clearly label any updated builds.