I've tried it on most things in stage 1 and I've noticed it works on pretty much any small projectiles, ranging from bullets, missiles, the big red bombs that those bots drop on you, and even those lasers that those armored turrets shoot at you. Awesome stuff.
If you want to dodge and all that other BS pointless stuff you can buy just hold down the dash button and hammer B and watch your character dance his way through the level dodging everything. I think its suppose to be used for getting all S ranks because fast time gives u 3000000 million points --- DKR / Nick: broie / FC: 017.270.711.392/
Posted this on another thread already but the B-Button commands are as follows:
Tackle: While running, press B next to sandbags, explosive barrels, etc to ram in to them and send things flying.
Vault: While running, press B next to low-lying hazards, like crates, low flying projectiles, Alligators, etc, to vault over them.
Dodge: While running, press B next to chest-high hazards like most projectiles, the exploding flowers on Stage 2, etc, to duck under them.
Reflect: While standing, press B when projectiles are nearby to reflect them back the shooter. Works against most small projectiles. Surprisingly, also effective against the red bombs dropped by flying robots and the sniper bullets on Stage 2.
Ambush: Press B next to certain enemies to evade around them. Press X before the animation ends to shoot them in back, like a boss. This works against most 2D enemies. 3D enemies like the Fixed Gun Turret will just laugh as you ram in to them.