You're perfectly fine asking. I was honestly hoping to get feedback or discussion going when I made this post.
It's a mix of a few things, I suppose.
Originally, I was just trying to learn GB coding to help a musician make an album that would play off of a GB cart that he could sell at his booth as he visited conventions. I started making early versions of this game to put those skills to practice and decided to continue developing this as its own game for fun.
Another not insignificant factor was that I wanted a small side project since most of my other games suffer from feature creep. The needs of many of my projects often grow faster than I'm able to develop my skills working alone. This was, in part, an exercise/challenge at keeping the scope of project small by using limited hardware to reign in my overactive need to add features.There's also just the nostalgia factor of having a new game on a physical cartridge (which I plan to make the finished game available on.) When I found out that I could make my own GameBoy cartridges at home with a soldering station for relatively cheap, I set out to design a cartridge to go with this game.