First of all, I'm really happy that you like these two games!!
Regarding HERO is Back 2, the walls of the caves are already of different colors depending on the level, but, by graphic choice, the colors are rather dark and dull, so the difference is not so marked.
As for the level editor, it would be a significant additional job and given that the game, in 2 and a half years, has been downloaded less than 600 times and I have received donations for only 16 dollars, it is evident that the game is not so liked by most of the players, so it's not worth it. If I ever made a level editor, I would make the game downloadable for a fee, but this is not possible because the rights of the original game are reserved and I would be infringing the copyright.