Not bad, I'm kind of surprised that people are getting so offended by this. Newgrounds has really gotten soft over the past few years.
I guess the first issue with this game is its simplicity. In the experiments, all you do is mash buttons. But worse yet, you don't even have to use any particular order. For instance, in later levels where you mash A and D, or N, A, Z, and I, you can mash them all together instead of alternating. A simple circuit that required you to actually alternate between A and D, or spell out N-A-Z-I repeatedly would have made the game feel a little more complete and polished.
As far as the graphics go, I don't mind the minimalistic approach, but it could have used some special effects or something. Again, pixel art isn't necessarily bad, but it still should have had a little more, to keep the player interested if nothing else.
As far as the concept goes, the text about the experiments was in rather small font, and advancing with the mouse was kind of annoying. I wish you had at least put something like 'Press Space to continue', especially seeing as this is primarily a keyboard-controlled game. The small text, while readable, somehow messed with the immersion factor for me. So did the incredibly simple gameplay. Putting in more sound effects would have definitely made this game better, and the one song that plays is a little annoying (not bad, but gets old fast).
In my opinion, the best way to make this game funnier would have been to incorporate some kind of mechanical sound effects to really illustrate the experiments themselves. Screams would have also given this game a more morbidly offensive humor value, and I think that's what you were going for.