Great joke. Open question: is fifteen minutes of it fifteen minutes of game, or fifteen minutes of one punchline? My money says the laugh lands well before the timer runs out. Still go and play it. Just don't expect the back half to keep escalating.
Tone is what carries this. A mosh pit drawn as a furniture catalogue is funnier than most deliberately funny worlds manage, and the bit is still standing after the first minute.
Right, I laughed. Flatpack furniture names screamed over death metal is a far better joke than it should be, and I stuck around longer than I planned to!
One gag, that is the premise. Flat pack furniture rendered as death metal lyrics. It commits so hard to that gag that an entire daft world falls out the other side of it. Fifteen minutes of surviving a mosh pit is a clever shape for a joke as well: long enough that a run has stakes, short enough that the bit never curdles. All of it played dead straight faced, and that is why it lands.