You say it's very Buggy but didn't say where you bugged so I can't really fixed anything for you.
Menu will get rehauled on the next version, yes.
What was strange about the narration?
Is 546 mb that much of a file size to be mad about file bloating? THe files that are unused are not loaded when you launch the game so it shouldn't affect your experience.
The game is literally free here so it will get better later on yes and I'm mostly making everything myself with the help of an artist.