About
ascii-invaders is a text-mode, Curses-based recreation of Space Invaders originally written in C in 2001 and later published on GitHub. It's playable on Linux, though the author himself flags the implementation as having technical flaws (unsafe signal-handler code and reliance on global variables), and development has halted.
How it differs from the original
It renders the game entirely in ASCII/curses text characters rather than graphical sprites.
History
The code originated as a personal project the author wrote and published in 2001, then revisited and re-released over a decade later in 2013 without ever incorporating portability patches that other users had sent him by email over the years.