This game is basically just the ideal 2D Metroid engine but unfortunately applied to the map of the original, which let's be honest, was not good. They modernized a lot, but at the end of the day, it's a map that over-relies on backtracking and "Metroid moments." There's a reason why the best Metroid fangames' physics and mechanics are based on Zero Misson's, but they have their own more unique and interesting maps. Not that this map is bad, mind you. And I like that this is one of the few Metroid titles that encourages you to low% it. It's nearly perfectly, just hampered by being a remake of NES Metroid, rather than its own thing entirely.