Metroidvania style with multiple characters to switch between. So it's all one big level but you get different areas reachable depending on the character and upgrades you're using. It's like, I can get up to that bit over there if I use the guy with the wall jump, oh, but I need a different character to blast through that ceiling; how will I get him up there? Lots of upgrades, lots of weapons. Secrets everywhere.
Fuck it, I don't even care about Megaman, I just want to see more Metroidvania games.