Nice to see someone go with the original game feeling of their hack. As long as it offers some unique challenges, it'll be fun to play!
As for lack of cacti on the desert, blame Nintendo for including not enough variety in Super Mario World. That's also okay if a desert doesn't have those plants.
That guy who wasted time on making his BLDC level and posted an unfinished and impossible product. Eventually, the host removed the submission and the author of the level deleted the redundant file. Remember, kids, never slack off making your own level, particularly right before the deadline.