I've only just been continuing off of my old save file, but the new content is TERRIFIC. I have loved every second of it, from the awesome character development and the incredibly difficult battles to the QoL additions and sprite edits (NPCs and PCs alike, every edit was superb.). And based off of what everyone's been saying, I have no doubt that starting a new run will be 100/10, too! I cannot WAIT to get started on a new save to check out changes to the old content.
You guys are absolutely AMAZING. Be proud of what you've made, because this thing is a masterpiece.