I just finished Turbo Man's stage. Wasn't so bad as the first time, as I didn't have any trouble with the fire section. After that, there was a mini-boss and I finally reached Turbo Man.

He was weak to the sound wave attack, and very easy to beat. I think I would've had a really tough time with the default weapon.

So I've finally reached the Wily stages (no disguise this time!). Feel like I'm missing some optional stuff, but I guess I'll try finishing the game anyway.