Megaman: Rock Force is a fan-made game based on the Megaman universe. I've been watching a 'Let's Play' of this game and it seems really fun. The character design is really good and I like all of the boss fights and stages.
Now, I love the Megaman series, but admittedly, I suck at it. For me, it's more fun to watch others play it so I can live vicariously through their grief.
My favorite part of the series has been all of the enemies on screen. The ones in this game are really creative and look fun to dodge and destroy.
Of course, there are Mets, but at one point, they get top hats!
You can check out some more info and download it for yourself. I haven't downloaded it, so I can't attest to the reliability, but I haven't heard anyone complain about it.
Now, BRING ON THE MEGAMAN GIFS!!!