Somehow I figured out the things. Most of the shields are not works against projectiles which can hit multiple times (sometime it is reflect the first hit, but sometime not). For example King unable to use the reflect shield against Gyro Man, its attack will always hit King. The standard shield sometimes able to guard the very first hit. The same goes against Cut Man or Metal Man.
What I seemed to notice is the exact same thing. Projectiles that seem to hit multiple times (aka ripping) are the ones that seem to go through shields. (BRG's rod deflect as well). I believe projectiles like Tomahawk feathers, Thunder beam shots and Gemini Lasers go through shields. I also know for a fact that BRG's illusions can also go through shields. (A defending Saturn or King for example).
As for MWS, most of the time his shots do 20 damage. It could be armor values being the reason why. Also, increasing the push's strength for his alt should fix this.
Should the shields be able to block (Or have a chance to block) melee damage? (EX: Slash man, Roll, etc?)
Back to Timeman, I actually realized that he does decent damage, however, I think one point that could use improvement is his alt-fire (The two angled shots). They move really slow, (which is fine) however the rate of fire is noticeably lower than his primary while also doing lower damage. Could that get a slight rate of fire buff?
I know I'm fighting a useless battle regarding woodman, but what about lowering the rate of reloading ammo? (After you fire the shield, lower the regen rate of the ammo slightly.) In turn, could you possibly lower the amount required to have the raining leaves fall? (It currently requires approx 75% of the bar. What if it was lowered to 60% because it generates at a slightly lower rate?)