Sorry if it seems like I'm spamming, but there's an official way to play this.

Get the games .swf from Newgrounds (where it was originally published) and run it in the latest version of Flash Projector (https://archive.org/details/adobe-flash-player-projector) which is Adobe's official program for playing flash games.

P.S. I saw in a previous thread that a moderator decided to allow copy pasting "play" for runs. I think this should be reconsidered.

Just use Adobe Flash Player Projector, it's from adobe and it runs games natively without emulation