How Do I Add A Charge For How Fast My Character Moves?

Like a mechanic where you hold down and the more you hold down the more it would charge and when you let go it shoots the character depending on how long you've held it on a path

 

i don't think that is possible

 

Similar to Sonic the Hedgehog 2? Hold button down, charge for x-seconds, release to accelerate forward. I was wondering if this was possible myself.

 

I don't know about what game you talk here,but you can do "illusion",when you press button go back slowly and on release the button to go fowrd fast .


and if you want to be fastener in game, you can add actions that change gameplay and make "Air drag" smaller

 

Thanks!