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(1 edit)

Good question! This guide is a great place to start: https://docs.unrealengine.com/en-us/Engine/Performance/ReducingPackageSize
Also for a game jam like this you can remove the UE4 pre-requisites and package as 32bit/Shipping to cut a huge amount of the file size. There's some asset level optimizations and design choices specific to this project as well.

thanks