Though Street Fighter X Mega Man was a fairly decent romp, there were quite a few issues that held it back from being as good as it could be. The free "Version 2" update mentioned a couple weeks back will be ready for distribution on Capcom-Unity's Mega Man group page on Friday, and though it doesn't sound like it'll fix all the problems, it ought to address the biggest offenders.
I never bought the logic -- that the game was too short -- behind not including a password function in Street Fighter X Mega Man. With the exception of the very first Mega Man, every single game in the grand overarching franchise has either used passwords or a save feature. Even the short-as-hell, six-stage Dr. Wily's Revenge on Game Boy used friggin' passwords. This oversight has been corrected as of V2.
There is now a confirmation prompt before quitting or resetting the game. I intended to discuss this in my review, but I cut it out and forgot to re-add it later. For those unaware, pressing the ESC or F12 key used to immediately boot you out of the game without warning. Other tweaks include bug-fixing, improved controller support (we won't know by how much until Friday), and buffs to make the M. Bison fight a bit tougher.
Does that sound satisfactory?