Oh, I see. I've moved away from Unity and am now working with Godot, so for me it would involve redeveloping from the bottom-up per the engine I use. Buuuuut, if "the code is very bad" is an issue, then redeveloping it with better code might be the best thing that can happen.
I guess it's not an urgent matter at the moment. You have something else you are working on (which I am excited to see and looking forward to playing), and so do I. Another developer who uses Unity might pick it up from that github link and do some renovation or expansion. Down the road, however, if the interest to partner with someone takes you at a convenient time, it'd be my delight to join you in tackling a reinvention of this game.