Play it if: a tiny, smartly-written distraction sounds attractive.
Don't play it if: if, well, it doesn't.
I never know quite how to approach ratings for Speed IF games. I think it's generally agreed that the general "quality" standards for the Speed IF process are lower (at least in terms of depth and scope). So a game like this, while very good for the format, is rather light when considered as a game in and of itself. Do I rate it high, putting emphasis on the circumstances under which it was written? Or do I rate the game and not the writer?
In this case, at least, I figure I'll split the difference and give it a 4.
Though it has enough puzzles for Django Reinhardt to count on his left hand, I Was A Teenage Headless Experiment makes its short length count and gives the player that nice "aha" moment the ideal puzzle should produce. Outside of that, there's a nice level of light macabre humor (the number of terrible head-based puns is thankfully kept to a minimum). A comfortable and memorable distraction.