Not sure if this is a bug but the proto armor doesn't seem to make any difference, I was killed after bumping into 3 bats, same as it happened with the classic armour.
Overall this is a fairly nice flappy bird like game but, imo, something is off.. maybe the flying 'curve-movement' is too wide compared to the screen size that we don't have enough view to dodge all the obstacles, making the game kind of luck based.
+I barely feel any difference after getting an upgrade that I don't feel like continuing to try all of them.