Managed to get a 41! was deeply confused at what was happening at first but got the hang of it eventually, I'm a little confused why you can move when the play area is so small and it's more optimal to stay in the center of the room.
I liked how you could get a bunch of ghosts at once if they were grouped up, I think a mechanic that'd take this up a notch would be some way to nudge the ghosts in different directions so you can purposefully group them up for a big combo
For your first unreal and jam project this is real decent work, you've got a simple arcade game loop that works well with the limitation, nice job!
(also in the future I'd have a look at reducing the filesize, or possibly embedding straight in the page to make it easier to play, 600MB is HUGE)