This is a desktop browser game! There are no downloads required haha
How are you viewing the game?
If you are viewing it in a browser, you will see a "Play Game" button near the top of the page. I recommend using Google Chrome for this, but other browsers should work as well :)
If you are viewing it in the itch.io app, you can install it as you would any other game. An Install button should appear at the bottom right corner! (Might take a while to load haha)