Thank you for that information. Under Edit > Project Settings > Packaging, you can change quite a few options to get the size to be smaller. The size difference will change depending on how many unused assets you had in your project, but it should help either way.
- For Distribution: Check this. It shouldn’t include any unnecessary files, as if you were packaging to sell the game to a consumer
- Use Pak File: This should be on by default and you’ve already mentioned you have it on, but just to say, it helps quite a bit.
- Include Prerequisites: This is on by default and you can turn it off to reduce the size in most cases, but it wouldn’t be recommended for actual release since the prereqs may be needed by some people.
- Include Crash Reporter: Same deal as Prerequisites. Unless you need to get crash info from your friend, you can leave this out.
- Create compressed cooked packages: Simply compresses the data, turn it on to help out with size.
- List of maps to include in a packaged build: For this one, it’ll help even if you’re only using one map. Press the + icon to add an element and then use the browse (…) to select the map from your content folder. This’ll let the packaging process know that it only needs to include this map and only the assets it references.
Let me know if this helps at all.