I definitely agree with all of this. It was my first time doing a proper project/game jam and I definitely felt the time constraints. I really wish that I had found/made time to improve the clarity of the game. As to the full-screen thing, I didn't actually think about it until after it was too late to update the submission, it would definitely have been a big improvement though.
Thanks for the kind words and playing our game!
EDIT: Just to add to this, I didn't actually realize there was an option to do it through itch.io without editing the submission. Have now enabled this. Thank you for mentioning this and causing me to look at it more. :)