At the end of the game the password screen says to put the code into part 2, this part, but you actually are supposed to put it into part 3. Sorry about some of the bugs. If you die to the boss, just reload the game, because there is a bug that makes the boss continue doing attacks after death. All of these bugs are fixed in the 3rd part, I can say for sure. Here is the link to part 3.
construct.net/en/free-online-games/mega-man-remixed-refixed-part-57907/play