It's fine with me, but you should know that i'm not the composer. In the case of this track Croaker is the composer and you should credit him if you use this track even though the track doesn't seem to be copyrighted (according to youtube). You can find a link to the original music file in the description.
sounds like a very weird pizza tower track for some reason, (not just cause it's tracker, but probably cause of the zap noise or whatever I should call it)
[Disclaimer: I've never written a demo, but] Have you checked out Preacher's article in Hugi Magazine № 30 (it's about design of old-school demos)? Smash (of Fairlight) had his blog called "Direct to Video", but demos of his team are the high-end, plus he hasn't updated it since his departure from Sony... For other high-end demos there are often seminars during parties and they are usually recorded (hard to recommend something specific, but if you find something specific from Fairlight, ASD or Conspiracy, it's always worth a check).