1. Thats no need to me arrogant its just my point of view on changes that could make de game better in case they want to improve it.
2. Even beeing only a game jam game, for developers it's nice to have some feedback on what could have been done better for the next time or even for a comercial game in the future. The comments are there so people can say what where their impressions of it. In general I loved it (the design is really nice, the cute and wierd/spooky characters are realy cool, and I love the Coffe Shop Theme), just thought it could have some simple improvemente on the gameplay and it could be way smoother and nicier to play.
3. Yeh! I noticed it but only on the second try around because it was "washed out", difficult to see on a firts look and i passed trough it without even noticing. As an importante informantion as it is (without this you can't play) it shoud be more visible, maybe with more colors or even with a tiny tutorial showing where it is. Because just as you noticed (since a saw that you replayed some people to look at the menu) i wasn't the only one with this problem.