You made a 4.4GB game for a weekend Game Jam OMG haha
Well I know Unreal Engine games are big on file size so this was to be expected. The game is very interesting and visually it turned out really cool, I definitely think it's something you should continue to work on.
The project ends up being very overscoped, so I imagine that in a period of 3 days just what you already do on it must have been a lot of work, but if you decide to continue working on it after the end of Game Jam, with more work and polishing I believe it will become something really cool!
I really appreciate what you are trying to do and I wish you the best of luck in your career! Good job!