For those that don't know, that is a scratch file. You can play it directly in the online editor by going to https://scratch.mit.edu/projects/editor/, the click on "File > Load From Computer". Then after it loaded the project you can click on the green flag all the way in the top right to play the game.
I really like the cutscene, it's so surprisingly dramatic considering it's only 3 images. :D
unfortunately the game itself stops pretty much after you killed the first enemy, not sure what else there is after that.