Yay, thank you!
I've taken the notes that the cave level was far too long in comparison to the other maps.
The dark screen ending was my brain failing to execute 'Think.exe' before the deadline. If I were ever to revisit this and fix it up I'd fix that ending first. It's really rough and unpolished. Even worse I ALMOST forgot to add Theme 6 to the start!
Again, thank you for the feed back!