Star Shield is your friend... Strategy is all in a well designed Megaman. If you can beat a stage with only the megabuster without any problem, then you are probably facing a poor Megaman game (6 the main culprit). Not the case in that stage. Just use the Star Shield... and it's a breeze.
In my opinion, though, that goes against a good design philosophy of "every stage should be accessible regardless of which weapons you have," which is one of the issues I had with Megaman 2. I think that the player should have an equal chance of succeeding in each stage whether they only have the buster or the entire loadout up to that point.
When it comes to fortress stages, though, that's a different story, I love when they throw you into multiple situations where you need to select the best item of choice to get through unscathed, or else you risk taking lots of damage.

