The progression of its story and MC is natural. But the ending felt....rushed at the end. These two had hurt each other, bare their hearts out for each other. Imprinted their methodology and behavior on each other's lives. (MC becomes more and more cunning, Ran becomes more trusting and emotionally fragile from closing off for so long.)
The ending is very open, and I think as a testament to the quality of your writing, I can somehow predict that their relationship still wouldn't be smooth sailing. I figured they would still be hunted down, just with less intensity. The truth of the murder was never explained and revealed. (I suppose its left out for other routes.)
So I'm guessing it needs an epilogue for the sweet ending- to detail MC and Ran's future. It doesn't need to be all sweet, but to leave a more conclusive note on their destination and the world around them.
Ran is still an Albino and still sought out. MC is still a runaway princess, there's no telling when the murder crime will be shifted on her again. To be fair life in the world of Wilder will never be smooth sailing, but at least leave a clearer picture of its aftermath.
I love this series and VN, and will be buying all routes because I want to explore more of the world of Wilder. If there's a epilogue fanbook, I think I'll definitely buy it digitally.