I don't have much input on the gameplay that wasn't already said, but I enjoyed this demo and the game looks promising! I am personally not much into weight gain as a kink, but I do love clothes ripping/humiliation/noncon stripping, which this incorporated pretty nicely.
I have a suggestion/request, which would be the addition of underwear to the character models. I've got a thing for underwear so seeing or having it implied to be stretched/ripped during the gain would be cool. Of course I totally get if the dick showing through the pants popping open is the preferred intent, or if the addition of undies is just not a priority, but figured I'd throw it out there in case there are like minds!