There are a couple of reasons actually. This was the very first game I ever made and of course, I made some mistakes. The first is that this game is a nightmare under the surface, it has a lot of variables and processes working together that make it very solid when everything works but easily breakable when you wanna add something new.
This game has no script, I wrote it time after time when I updated it which means that if I want to write something new I have to play it all to get in the mood. Also, I honestly thought this game was dead and no one waits for it. It was a real blow to the heart to drop it because I really love every single character I made for it but it requires too much work and time to fix it. Also, I can't even upgrade the window size and I'm stuck with the 640x480 resolution.