Janus is included in the Bundle Argentino de videojuegos gratuitos y para desktop
This is a Space Commanders clone made in 1995.
It was coded in Pascal and Assembler and run on DOS.
It runs fine on a DOS emulator (DOSBox).
Download it and follow the instructions inside the zip file.
The source code is on GitHub at https://github.com/luisparravicini/janus