You have to download the swf flash file and play it using a flash application like the official Flash Projector program for it to work properly or use some other flash workarounds
https:\/\/uploads.ungrounded.net\/358000\/358401_7DS.swf?f1168291078
https://archive.org/download/adobe-flash-player-projector
I love this game and sad that it doesn't work on Newgrounds anymore.