Alien Arena is now on itch.io!
https://alien-arena.itch.io/alien-arena
It's not a new game, but the Alien Arena Installer for Windows is new, and this is the easiest way there is to install, update and launch Alien Arena.
Summary of the game:
It's an ultra fast-paced, old-school arena FPS. We play CTF daily with a group of friends. And sometimes an intense insta match or a tourney.
Single player against bots is possible too. There are many 3rd party maps available.
For more info, see https://www.alienarena.org.
This video shows one of those CTF matches: