Metroid 1 is my favorite Metroid game. So seeing someone else enjoying is a nice thing to see. Also, there are Metroids in the game. My advice is to have the ice beam when you beat Kraid and Ridley. You will regret it if you don't have the ice beam!
Anyway, the NES steaming service is the only reason to get the online service for me. I very rarely play online unless it is Splatoon 2 even when it was free. Right now I have some games to finish on the NES mini. So it will be awhile before I get the Nintendo Online thing. Also beating Zelda 1 walking through a forest without a map. Sure you can do it but you will get lost very fast and very often. When I first played the game I only used a guide when I had no idea what to do. It is a better way to play rather than being glued to a guide the entire time.