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Developer here. This game was made in Java+Libgdx so it's coming with a bundled JRE which makes up most of the filesize.

Is there a way to just get a .jar, for those of us who already have JREs installed?

Not as a seperate download, but the .jar is inside the .zip/.tar archive. You can just toss the "jre" directory if you want to use your own JRE.