This is a R4 save file.Online Save Game Convertor:http://www.shunyweb.info/index.phpThis save has all the keys, anti-'s, unlocked the special bomb, max level, max heart vessels, saved right before final boss. enjoy.
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)