Im inclined to say 255 is the highest score possible XD I was in the last area of safety until the smallest possible point! (May not be highest score but dont kill my dreams haha!)
You have an incredible understanding of what is important to add to a game in 3 hours. The art was all there, it was not trying to be more than it needed to be so it made it look super polished. The guide is essential and many would only add it after some feedback. That was great, genuinely, very great.