Hello! You have a nice platform game here, good job :) The snappy and fast paced controls felt really nice. One thing that I found odd, if you don't mind, is the fact that you kinda have to lose progress (platformer wise) to pick up the coins if they fall down, it felt punishing.
Also the coins seem to have a collider of their own I think, you might want to look at trigger colliders, since you're using Unity :)
Cheers!