I was playing this on console with the SummerCart64, quit from the menu after the 4th level, and it went to a black screen. Same thing when I try to reload the save now, black screen. The only reason I can think of is that maybe it's loading too much text for the Levels list to handle.
Was able to use the save file still on emulator so whatever. Just wanted to report this bug, maybe it's easy to fix!