As a reader/player of a lot of works be it text based games or even novels, I always feel a dread when creators want to remaster or rewrite.
Some times it can bring great results and some other times it's even difficult to see the differences and months, even years, can be lost on a work.
But I actually understand the feeling of growing or becoming more skilled in writing and sensing a disrepancy between the first acts of a work and the lasts.
So my advice is to finish your work, not because I absolutely want to it to be finished but because between today and the day of the "last line" your writing skill will grow. If you think you need to remaster the beginning wait until you're sure it will give the same feeling reading/playing from beginning to end.
Personnaly I think it can be fun immersing yourself in the game more and more as the author grow, the player follows. The want for a polished work is totally understandable and it can be a source of pride.
In the end you need to do what is best for you and your work. We, the players, will support you. Your game is amazing, have no doubt.