Thank you for both the kind words and the valuable feedback!
Level selection has been an option all the time, but when we realized how many levels we could actually keep it was already out of scope. We might still update it with new levels and a selection screen after the jam.
The original idea was having a split screen where every player could only see items he can interact with, so for example you could pick up the cube with the ghost and see it flying from the astronaut viewport. This design was cut to reduce the amount of assets needed and improve level readability, unluckily resulting in a game that feels less fitting to the theme, even if the mechanics are exactly the same.