I don't know how good your compression is or what would be gained by e.g. tar.xz or 7z compression. But when you send someone an ISO, and it's not meant to be burned on a CD or DVD, you convey an impression that it's uncompressed. Also, compressing the whole thing, instead of individual files, often results in better compression; that's why tar.gz is typically smaller than zip despite both of them using the DEFLATE algorithm.

But the really important thing here is you're just packing everything together in one archive. Wouldn't be a real problem if the download was small, but that isn't the case here. If this game were in the Debian repos, it would be composed of several packages: a package for the program, a package for the base data, and packages for extra data. That's the kind of thing you should do.

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