This game is my ultimate hack and the last one, it is compose of mostly all bosses of SMW and its a very long game but really fun to play, If you want to see the gameplay here it is so enjoy https://www.youtube.com/playlist?list=PLQseeMDEZyyOxmyRr4zFT1qhM2C6Be4Au
You didn't even try. Atrocious palettes - repetitive and quite frankly, extremely lazy level design - a tedious boss rush. I'd list examples, but that becomes redundant when literally the entire hack counts as an example.
I'd highly recommend you just scrap this and start from scratch. I don't see any way you could fix this at all. It lacks all the fundamentals of even a decent hack, and at this point, something new would quite honestly be easier to do. Make something you know yourself and others would like to play. Effort is greatly valued on this planet.