Wish I could. Writing and developing a VN is a messy process, at least it is for me.
This is how that graph started out, nice and clean and manageable, with the promise that all icons filled meant game finished.
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But along the way, there's all this stuff that just comes up as part of the creative process: stuff gets rewritten, usually expanded in scope, extra scenes are plugged in, disaster strikes, etc. So this is what we end up with.
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I could just have a number based on the fraction of filled in vs open faces on the bar, but that would hide all that chaos going on during development. This graph is meant to be messy and convey the unpredictability of the process.
Just try to intuit it, and it'll start to make more sense.