Please make it so the invulnerability is instant the moment you press it--and not when the dash animation begins. I'm tired of getting thwacked for being too fast for the game. How can you expect people not to use it in these instances? I'm not being one of "those guys" but I'm just saying...0.1 response time is common so you should have factored it out.
It's not supposed to be a "press dash to win" button. It takes skill and practice; this thread looks like a standard case of you needing to lern2dash. If it were any other way, any bozo with half a brain and a broken finger could dodge over traps whenever they wanted.