Very nice game, had a lot of fun! Everything that I have a problem with you seem to be aware of because you listed them in your after the jam plans. The biggest things were that the ghosts were hard to see at first but I got used to it. And that it felt very unfair when I almost completed a level just to be catched by a ghost that just spawned in the door. Your fixes: "Allow the player to goto the next level if they hit the exit even if they've been caught by a ghost" & "Add a timer in front of the door to show when the next ghost will spawn" would fix this perfectly. Even if not a timer just a little indicator that would fit in with the game a little better. Yeah and the pillows were sometimes hard to collect.
Apart from that, great game, great sounds, beautiful graphics and overall fantastic entry. I like the double-challange that its a different kind of game on the way back.