played all 3 routes, 1-2 as mega 3-6 as bass 7 as proto. the main, and only real difference between them is their dashes. mega man has the slide, proto has a shield bash (that doesnt do damage or protect him) and bass has an air dash. what this means is that mega is the best character and bass is the worst.
this game is fun. tad easy, even on difficulty 4 but i definitely enjoyed it. boss weaknesses were fun to learn, and even without them the buster works perfectly fine. i swear napalm mans design changes every appearance, which is weird but hes my favorite either way. id say it was worth 4 bucks, if i had a friend irl that also liked mega man id definitely want to play this with him.