So I got up to Wily but couldn't beat him. Decided I needed some M/E tanks...left the tower. Word of advice: DON'T. You have to do Wily's Fortress all over again if you leave it. Get everything you need (including the half damage for the last level) BEFORE you go there.
EDIT: Some more helpful hints, I've figured out the boss weakness chain.
[spoiler] Plug Man -> Tornado Man -> Magma Man -> Hornet Man -> Splash Woman -> Concrete Man -> Galaxy Man -> Jewel Man -> Plug Man
Plug Ball works wonders on Tornado Man and can it him if he's floating near the ceiling. The ball also destroys the whirlwinds he summons so you don't have to jump all around to avoid them.
Tornado Blow weakens Magma Man and puts out his flame (roffle), making his shots smaller and weaker.
Magma Bazooka wrecks Hornet Man and his little hornets easily.
It's easy to spam the Hornet Chaser on Splash Woman, especially in her face. Just don't use it too much when she summons the fish because the hornets chase them instead...
The Laser Trident tears through Concrete Man but has no visible drawbacks on him that I can see.
Concrete Shot wrecks Galaxy man but again, I don't think it has any major drawbacks on him.
Blackhole Bomb rapes Jewel Man and cancels out his jewel satellite.
Jewel Satellite wrecks Plug Man and deflects his projectiles. [/spoiler]
I'm not sure what works on the bosses in Wily's Fortress, I mostly used the buster.
Tag - "No trolling on my watch!"
