Linux version only has the 32-bit Unity executable in it. :(
If you choose x86 + x86_64 (Universal) you will provide both the 32 and 64 bit versions.
I may have time to see if I can get 32bit programs to run on my 64 bit machine.
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Oops, sorry, I didn't realize Linux had an issue with different versions like that! (I really know very little about Linux other than some command line usage.) I'm just heading to bed now but I'll compile the Universal version as you suggested first thing in the morning, and reply again to let you know.
i did some research. It looks like the 32bit libraries may be able to be installed on a 64bit version. But aren't by default as the are not needed. Since this isn't installed via a package manager, dependencies are not auto installed (which in this case is the 32 bit libraries).
32bit comes with some significant memory limitations and what not. I believe the only reason to have 32bit binaries for any OS would be for backwards compatibility with old computers that don't have 64bit processors.
64-bit Windows has no problem with 32-bit software, and this little game doesn't go anywhere near the memory limitation of 32 bit, so there was no reason to make it less compatible (many Windows users are still on 32 bit, since there seems to be a dislike of updating in the Windows community). I didn't realize it was an issue for Linux, or even that the universal option existed.
Anyway, Linux version is updated. Feel free to redownload. :)