I am Dr. Frankenstein and Photoshop is my operating table

I think that is incredibly cool that not only did you make something that fit the project description but that it also served a practical purpose AND helped out a friend! I also I really like the title of your project. Its edgy but not in a stupid internet way and its clever. The only thing that kinda messed with me was that it did not seem to have a super coherent theme. If the streamer friend also stream Mario then it makes sense but coming from watching twitch streams I would say the more cohesive the better.

I really like your idea to choose the target audience first because it's better for marketing. And this is a truly commercial art. I also think your photoshop skill is very cool and final product is very nice. The thing is that I don't think know what kind of thing you are specifically marketing. If you can do some true marketing after you make your product and see what's going on later, I think it will make a better project.