I have actually never seen a developer who (for free) was able to create an immersive game with a compelling story that made the NSFW worth while, I played both Once in a Lifetime, and .4 Eternum, and the stories in both games hooked me instantly, also, the light refences to Once in a Lifetime is the most clever thing you could have done, and Chop-Chop being stabby mike appearing all over, is too good
TL;DR: W game and W writing