The zip file is your best bet, but you'll also need the Love2D framework version 0.10.x! Yeah... not that simple, especially after Love2D version 11 came out. Maybe I should update this to work under version 11...
Anyway, unzip the file and run with command
love SYZYGY.love
I only now realized the .deb file needs also the love2D framework to be installed correctly, so I removed it altogether to avoid confusion. Apologies for the late reply and unclear instructions!