I did get that queston a lot. xD
well to be honest I don't know..
I'm a really inexperienced developer (this is my 4th project) who learns everything he knows from youtube.
so probebly I do something wrong that makes it s heavy.
did also some other unreal engine games during this jam, who seems to have the same problem..
so the short awnser is that I'm really a noob who doesn't know what he is doing xD
(but if you know good tutorials for making the file size smaller than please let me know ;D)