Mega Man 2 basically took everything good about the first game, polished it and improved it in every way imaginable with more refined controls, less slippery platforming, much better stage design, iconic boss fights that provide decent challenge, more variety in the obtainable powers and improved difficulty balancing alongside another incredible banger of a soundtrack. I can totally see why this game gets the (well-deserved) praise that it gets. A legitimately fun game that I could totally see myself playing more in the future whereas I never want to touch the first Mega Man ever again.