I think it would make a lot more sense for the top loft arrow to take you back on page rather than back to all of your projects. As someone who uses the internet (like most) I'm used to having the arrow in that location go back one page. What this mean is that several times each day I swear at the browser for taking me right out of the entire file path, often several folders deep.
What I think would work better would be a home button, taking you back to the projects overview, next to both a forwards and a back arrow more in line with what we're all used to on internet browsers.