Sprites would be the easy part, the hardest part in my opinion would be porting the music. Everything would have to be re-done in MML. And if you wanted to be thorough, most if not all of the instruments would have to be programmed

Don't feel too bad. One time I got stuck because I used abd instead of and

Truth be told, I've been toying around with the idea of recreating the Sans fight so people can try it without having to murder everybody.

I hate when that happens