Assuming the GBC colourisation options do not do it for you then there are a fair few options for colourisation.
Equally a decent number of GB era games had options for the super game boy. Find an emulator which supports such things (though we are in the GBA section so I don't think goomba ever gained that as it was something a bit special) https://en.wikipedia.org/wiki/List_of_Super_Game_Boy_games
I did see a few proof of concept hacks to turn GBC into GB a little while back and the principle could be done in reverse, indeed many of the original devs probably did something like that for the DX/GBC enhanced versions. Would be a fair bit of effort though when other options exist.
Any time it looks like you're in an unwinnable situation that will require you to restart the entire game, it overwrites all your saves with that autosave.