hello, thank you for the compliments. and ill say that your are spot on with your observation, as the very last thing i added in the jam before we ran out of time was the fade to black between levels (and even then i wanted to have fancier transitions than a fade between scenes :( ).
but my to-do list during the last hours of the jam looked something like this: scene transitions, some UI animations for losing & collecting the sandwich, and a better game over screen for the stage mode, however due to some IRL last minute hiccups even adding the fade to black was just barely within time for me unfortunately, but that's how it goes in game jams sometimes, but for a game jam i'm overall satisfied with our end product :)