Some people says that Windman is an "Airman-wannabe" but I never really understood why. Sure both of them are air-themed bosses, but Windman's stage is very good, I love the ascending effect of the propellers and the flipping platforms. Airman's stage is good as well, but I have to say Windman's level is better designed. Maybe Airman's music is a bit better, but Windman's theme is catchy as well. Windman is the perfect example that an easy boss fight can be fun. He is fairly fast and he is always random about what he will doing. For example, no one says that Heatman is a "Fireman-wannabe", but Heatman is inferior to Fireman in terms of bossfight, stage, music, weapon.
Need some love for Windman!