This is a very silly game that I made.
You will need to install Python 3. You can get an installer for your system (hopefully) at Python's official website.
You will need to install the game's only dependancy, pygame-ce. Open your system's command processor ('Terminal' on macOS and Linux, and 'Command Prompt' on Windows) and run the command python -m pip install pygame-ce. If that fails with soem error message like No Module Named pip, try running python3 -m ensurepip.
This should be all nessesary to install the game. If none of that works, it is worth noting that windows is not officially supported. You could try (if you know how) to install the game under WSL.
To run the game, run the python script run.py from the root of the game folder. The game folder is wherever you unpack your .tar.gz file to. TAR/GZ works the same as ZIP. Run run.py by navigating to the game folder in the terminal (or cmd) and running the command python3 run.py
When you download and run the game, you are just downloading the source and running it. To browse the source code in a web browser, go to the github repository