A note for Ubuntu users: there is a PPA for the unreleased 0.8.0 version of LÖVE: https://launchpad.net/~bartbes/+archive/love-unstable/.

Google failed me today while trying to find the syntax for adding a PPA from the command line (largely because Google will not search for punctuation, even inside of quotation marks), so after a long search trying to avoid pages about human colons and professional associations (eventually settling on the query "ubuntu ppa apt-add-repository"), I'm posting this here (ref: https://help.ubuntu.com/community/Repositories/CommandLine):

  sudo apt-add-repository ppa:bartbes/love-unstable

Followed by the obvious:

  sudo aptitude update
  sudo aptitude install love-unstable
  love-unstable mari0_1.2.love