After spending so many hours on it this week, I can confirm the game is complete EXCEPT for the music. 

I won't be changing anything now: No graphics, dialogue, puzzles (obviously). Any new ideas I get now will have to wait for the future. 

Music

It will take time to do the game soundtrack, but I think I've written Undy's theme. Certainly, I have a few melodies already made this week that might work in different scenes.

Speedrunning

I would say the game should take maybe 45 minutes to finish. It's hard to say, and everyone is different. I'm excited by the potential for speedrunning it!